How to learn from creationists

“The wise learn from everyone.”1 The freak success (half a million reads) of my recent piece How to slam dunk creationists, and the subsequent discussion, have again set me thinking about how to learn from creationists. It is not enough to say, as Dawkins notoriously said, “[I]f you meet somebody who claims not to believe in evolution, that person is ignorant, stupid or insane (or wicked, but I’d rather not consider that).” Conversation is a two-way street, I have certainly learnt from creationists’ attacks on evolution, and if I am learning from them it is at least possible that they are learning from me.

Types of comment

Comments I have had from creationists fall into three broad groups (and note that contrary to what Dawkins says, some of these are at least partly informed, highly intelligent, and completely rational):

1) Simple misstatements

2) Appeal to the Bible

3) Purportedly scientific arguments, some without merit, while others refer to important issues.

From simple misstatements, not very much can be learnt, except perhaps the source of the misinformation. Remember that if someone quotes wrong information, the burden of proof is not on you but on them. Leave it there, as in this actual exchange:

Creationist: Chimps are not our relatives. The genomic similarity between humans and chimps is only 29.8%.

Me: “The genomic similarity between humans and chimps is only 29.8%”; if so, I have been seriously misinformed. Please give your source for this information.

I am of course being disingenuous. I do not really think that I have been seriously misinformed, and I could have cited the standard literature value of over 98%. But much better to leave the burden of proof where it belongs. Meantime, I have (truthfully) presented myself to bystanders as open to new information, if only the creationist would supply it (he didn’t).

What about the Bible?

When it comes to arguments based on Genesis, I have seen two different strategies employed: you can either

a) Denounce the Bible as the ignorant writings of bronze-age goatherds, or

b) Describe the Bible as the written and rewritten work of scribes and scholars, over many generations, doing their best with the knowledge they had at that time about how the world works, and constrained to express their beliefs in language that made sense to them and their contemporaries.

Which do you think is more likely to win new friends, and which, for that matter, is more accurate?

With preamble (b), you can discuss without rancour the internal and external evidence that the Bible is not a historically accurate document. It gives us a world-wide flood, and reduction of humanity to a mere eight individuals, just when the Egyptians were busy building the pyramids. And the Egyptians didn’t even notice. The place names and customs of Genesis and Exodus match those of the Two Kingdoms period (Israel and Judah, 7th Century BCE), not the much earlier Bronze Age to which the patriarchs and Moses would, if real, have belonged. And there is the notorious conflict between the creation stories of Genesis 1 and Genesis 2, just one of the Bible’s many internal contradictions. Remember however that the biblicalist will have met such arguments before, and I would advise against detailed discussion of particular verses, unless you can quote the original Hebrew.

And now to science

A creationist favourite: mutation plus natural selection cannot generate new information, since mutation merely generates noise, and selection can eliminate, but not produce, novelty. My reply (and I found it instructive to have to formulate it), and how it led to a further informative exchange:

Me: You are right twice and wrong once about how evolution works. Correct; selection alone cannot create novelty. Correct; random mutation alone cannot create significance (and most mutations are harmful or at best neutral). But, as in the case of genetic algorithms, the combination of the two of them can indeed create meaningful novelty. [In computing, a genetic algorithm takes an initial computer program, allows it to mutate, compares the new program with its predecessor, keeps whichever is better on some pre-established criterion, and repeats.]

Creationist: Genetic algorithms are designed to reach specific pre-defined goals. Natural selection isn’t.

Me: Natural selection has a very specific pre-defined goal. Survival.

The problem of complexity

Evolution of the mammalian eye (schematic). Click to enlarge

Then, of course, the evolution of complex systems. The mammalian camera-like eye, with retina, lens, and pupil. This is an old creationist favourite, perhaps because Darwin himself said2 that “To suppose that the eye, with all its inimitable contrivances … could have been formed by natural selection, seems, I freely confess, absurd in the highest possible degree”. We have, however, learnt quite a lot about this since 1859. Darwin went on to spell out all the things that we would need to show in order to explain the evolution of the eye by natural selection, and in this he has been fully vindicated.

Other multicomponent systems. Flowers and pollinators. Male and female. The blood clotting system. The bacterial flagellum. Parasites and their hosts.

How does the Sun move across the sky? Here’s an answer, from 4th Century BCE Ilium. Click to enlarge

Here I think we need to answer at three different levels. At the most general level, the creationist is claiming that because we don’t know how something could arise by natural processes, it could only have arisen by supernatural intervention. Technically, this is known as the “argument from ignorance”. In antiquity, it might have been used to prove the reality of the Sun God’s chariot, and today it is routinely used to invoke a miraculous origin for life, or for the Universe, or for consciousness. It is a pernicious argument; because we haven’t found an explanation within our current science, we are invited to stop looking.

Going down a step, all the arguments involve the assumption that the systems would not work unless all their parts were already in place.

The bacterial flagellum, and the injectisome to which it is related. Click to enlarge

Well, perhaps they would not work so effectively, or in the same way, but to get the ball rolling they wouldn’t need to. Good examples here are the blood clotting system, which involves the operation of a large number of successive steps in order to stop bleeding, and the bacterial flagellum, a kind of “motor” used by some bacteria to propel themselves, through the combined action of many different protein molecules. Both of these were produced, and both found wanting, as examples of irreducible complexity at Kitzmiller v Dover,3 where the critics of Intelligent Design creationism were able to point to numerous partial precursor systems. As the links cited here show, the family relationships between these are the subject of active ongoing research.

Finally, getting down to particulars, what the creationist is actually doing is setting out a series of excellent

Life cycle of Heterophyes, a parasite that uses three separate hosts at different stages. Click to enlarge.

research programmes, many of them, as mentioned in the case of the flagellum, already vigorously under way. Life, alas, is short, and there is not time to satisfy all one’s curiosities, but it is always instructive to have that curiosity aroused. My reading has certainly benefited from creationists’ questions about the eye, the appearance of new species, random drift versus selection, whether evolution is the same thing as progress (it isn’t4) and the evolution of parasites, some with extremely complex lifecycles involving several hosts. I am also left wondering how the creationists themselves explain the very existence of parasites, if they believe that every living kind was separately hand-crafted by a benign Deity.

Deep time

Then there is geology, and the Young Earth creationist challenge to the deep time necessary for evolution. I was asked, for instance, why the Colorado had carved out a canyon, but mightier rivers such as the Nile and Amazon had not, and why the Nile delta wasn’t much larger than it is if it had been in place for many millions of years. (What’s your answer? Mine’s at the end of this post. Good to be made to think about it, and more to it than I had realised).

This Geological Society Special Publication summarises historical and current thinking on the age of the Earth; free download here

And other alleged problems with the age of the Earth. The thickness of sediments suggests an age of “only” 100 million years, and if we divide the amount of salt in the oceans by the amount brought down by rivers each year, we get a similar number. So indeed 100 million years was the figure generally accepted by geologists at the end of the nineteenth century. But why do creationists keep talking about this? An Old Earth creationist has no reason to care, while a Young Earth creationist needs an age measured in at most thousands of years, so 100 million years is no better than the actual value of around 4.57 billion. No matter; conflicting claims have been made in the name of science, and so, by a lawyerly trick, we are invited to regard science in the same light as we would a witness who changed his story on the stand. The very opposite of the scientific attitude which (ideally at least) regards mistakes as both inevitable and instructive.

As to how geologists 120 years ago got it so badly wrong, it’s worth noting that logically their suggestions were lower limits. They took into account how fast material (sediments on land, salt and the oceans) was arriving, but had no idea of how effectively it was being removed. They did not know about subduction, part of the process of plate tectonics, which returns sediments to the Earth’s mantle beneath the crust. Nor did they realise the extent to which the continents had moved, cutting off regions as large as the Mediterranean basin and allowing them to evaporate to dryness, depositing their salt content.

Other old favourites

Macaque monkeys grooming

Some other old favourites: Why are there still monkeys? Answer: we have not evolved from present-day-day monkeys, any more than English has evolved from present-day German. Our last common ancestor with a present-day monkey was over 25 million years ago, and we’ve all moved on a bit since then. But still useful to be reminded that a modern monkey is the same distance in time from that common ancestor as the modern primatologist studying him. We are no more, and no less, evolved than any other life form, even if we have evolved in what are, to us, particularly interesting directions.

Archaeopteryx, the “Berlin specimen,” showing leg feathers later removed in cleaning. Click to enlarge. The 1863 specimen, referred to by Darwin, is in London’s Natural History Museum; its image is copyright but can be seen here.

And what about the missing links? This is a creationist favourite. Did not Darwin himself describe the poverty of the fossil record in his time as the gravest objection to his theory? Yet things were already changing in his lifetime, and the rate of change has been increasing ever since. In time for the fourth edition of The Origin of Species, we had the discovery of Archaeopteryx, a missing link between reptiles and birds, and if we now regard Archaeopteryx as a bit of a dead end, that is because we now have many more examples of intermediate species, and can see a clear line of descent which leaves Archaeopteryx on a side branch. Darwin himself, with characteristic caution, described Archaeopteryx as “that strange bird,” and simply used it as evidence of “how little we as yet know of the former inhabitants of the world.”

But what about human evolution? Isn’t that something more special? No. A century ago, it made sense to wonder at the scarcity of intermediates between humans and non-human apes, although we already had Java Man (now known as Homo erectus) and, of course, our Neanderthal cousins. Then, in 1924, came the discovery of the Taung Child skull, now classified as Australopithecus africanus, and since then a steady stream, showing not one but three or four lineages of which we are the only one surviving. (The Smithsonian’s Human Origins page gives a very good description of all this.)

But aren’t there still missing links? Yes there are, and there always will be. And yes, just as the creationists say, filling in the gaps is an act of interpretation. Find an incomplete sequence of footprints in the sand at the edge of the ocean, and you can interpret them as evidence that someone walked that way. Or you can insist that each separate footprint was the result of a separate act of creation, and none can prove you wrong. The same is true for the hundreds of thousands of fossils, all at the right place in the geological sequence, unknown to Darwin, but known to us. The creationist cites the inescapable incompleteness of the record, but under creationism we would not expect any record at all.

And some other good questions

The creationists raised numerous other important questions, to which I will be returning in my own reading, and some of which may feature here at some future date. The Cambrian explosion (hint: “explosion” is a relative term). Not seeing evolution actually occurring (yes we do, actually, all the time). What did our last common ancestor with chimps look like? And how could our large difference from chimps be achieved with so little difference in our DNA? (Good questions, still largely unanswered). The origin of life; we don’t know, lots of interesting work going on. Notice, though, that this isn’t really a question about biological evolution itself, but about what had to happen before that evolution got started. Think of the chemists, who had spent 150 years using and developing atomic theory before we developed any insight into the origin of atoms.5 The distinction between historical and operational science (yes they are different, but not in the way people usually imagine. It is historical science that is the more certain!) Evolution doesn’t explain consciousness, define morality, or give meaning and purpose to our lives (should we expect it to?) Are scientific statements the only rational ones? (My own heretical view: we can usefully ask whether a statement is rational, but I see nothing more to be learnt by then asking whether it is scientific.) No proof of evolution? A good jumping off point for thinking about what counts as “proof” in science. Or does science do proof at all? Much to think about here; much to learn from.

Those rivers again

Grand Canyon (image Luca Galuzzi – http://www.galuzzi.it) Note horizontal strata; the river has carved the canyon through a block udergoing uplift as a unit. Click to enlarge

Now what about those rivers? What about the Grand Canyon, and the absence of canyons for the Amazon and the Nile? The answers were pretty well what I had guessed, but with much more interesting detail. The Grand Canyon formed as a result of the uplifting of the Colorado Plateau by between 1,500 and 3,000 metres, and was further enlarged during the Ice Ages, when there was much heavier rainfall upstream. The so-called Eonile, precursor to the modern Nile, did indeed cut a deep canyon during the period, up to around five million years ago, when the Mediterranean was isolated from the Atlantic and dried up.6 So the expected massive sediments do indeed exist, but are now under water, and the canyon was formed, but has long since been filled in.

Strata bent by lateral compression in wall of Marañon canyon. Click to enlarge

The Amazon does indeed have a massive land delta, as well as underwater formations spreading up to 300 km from the coastline. The  river in its present form is only some ten million years old, with its headwaters reshaped by the rise of the Andes. If so, by analogy with the Colorado you might expect it to have carved up a canyon in the area of uplift, and you would not be disappointed. The Rio Marañon, principal feeder to the Amazon, rises on the west side of the Andes, and has cut a path deeper than the Grand Canyon through the mountains rising beneath it. And the difference between the canyons is as revealing as the similarities. In the Grand Canyon, the strata lie horizontal, since the river cut its way through the undeformed block of the Colorado Plateau. The Marañon, in contrast, cut its way through folded strata, buckled by the forces that built the mounrtains.

Conclusion

With evolution, as with everything else, we are blind to our own confirmation bias. We will focus, if left to ourselves, on questions that are easily answered, and avoid those that might make us uncomfortable. But such questions are by far the most instructive, and we owe a debt of gratitude to those who raise them, whether they want our thanks or not.

Some useful resources

“29+ Evidences for Macroevolution” http://www.talkorigins.org/faqs/comdesc/ especially Prediction 4.5 and Figure 4.4.1 at http://www.talkorigins.org/faqs/comdesc/section4.html#retroviruses

Speciation: http://www.talkorigins.org/faqs/faq-speciation.html and http://www.talkorigins.org/faqs/speciation.html . “Lizards Undergo Rapid Evolution After Introduction To A New Home” https://www.sciencedaily.com/releases/2008/04/080417112433.htm

Human evolution; Smithsonian Institute, http://humanorigins.si.edu/evidence/human-fossils ; timeline of human fossil discoveries, https://australianmuseum.net.au/a-timeline-of-fossil-discoveries

Whale evolution: Thewissen’s review article, free download, https://link.springer.com/article/10.1007/s12052-009-0135-2

The Cambrian Explosion http://www.geologypage.com/2017/08/mystery-first-animals-appeared-earth-solved.html Jochen J. Brocks, Amber J. M. Jarrett, Eva Sirantoine, Christian Hallmann, Yosuke Hoshino, Tharika Liyanage. The rise of algae in Cryogenian oceans and the emergence of animals. Nature, 2017

Historical vs operational science: https://pubs.geoscienceworld.org/books/book/667/chapter/3807501/Common-cause-explanation-and-the-search-for-a

1] Ben Zomah, Mishnah Aboth 4:1

2] Origin of Species, 1st ed., Ch 6, “Difficulties on Theory”

3] The 2005 court case establishing that Intelligent Design is merely a variant of religious creationism, and as such cannot be taught in government-run schools in the US.

4] The actual balance between selection, drift, and constraints in particular cases is a major research area. See e.g. my earlier Evolution is not progress

5] We can date the modern atomic theory to Dalton’s New System of Chemical Philosophy, 1808, and our understanding of how atoms are formed to papers by Fred Hoyle and colleagues in the 1950s.

6] h/t Lars Cade; for more on the Nile Canyon see Joel Duff’s https://thenaturalhistorian.com/2016/06/01/the-lost-grand-canyon-of-egypt-another-monument-to-an-ancient-earth/, https://thenaturalhistorian.com/2016/06/03/the-lost-grand-canyon-of-egypt-part-ii-origins-of-the-nile-river-valley/, https://thenaturalhistorian.com/2016/06/03/the-lost-grand-canyon-of-egypt-part-ii-origins-of-the-nile-river-valley/

First published in 3 Quarks Daily. An earlier version of some of this material appeared in The Conversation.

Bible image from bible-png. Eye development image Matticus78 via Wikipedia. Sun God in chariot, Ilium (Troy), Temple of Athena, via Wikipedia. Falgellum and injectisome image Matt Baker. Parasite lifecylcle from CDC via Stanford. Monkeys grooming AKS.9955 via Wikipedia. Archaeopteryx, from Vogt, C. 1880, Archaeopteryx macrura, an Intermediate Form between Birds and Reptiles, Ibis 4:434-45, via Wikipedia. Hominin skulls from Smithsonian. Grand Canyon image Luca Galuzzi (who must be informed regarding re-use) via Wikipedia. Marañon Canyon © David O’Keefe, via https://community.nrs.com/duct-tape/2013/12/18/perus-rio-maranon-another-grand-canyon/

 

 

About Paul Braterman

Science writer, former chemistry professor; committee member British Centre for Science Education; board member and science adviser Scottish Secular Society; former member editorial board, Origins of Life, and associate, NASA Astrobiology Insitute; first popsci book, From Stars to Stalagmites 2012

Posted on October 8, 2017, in Charles Darwin, Creationism, Evolution, Fossil record, Geology, Science and tagged , , , , , , , , , , , , , , . Bookmark the permalink. 13 Comments.

  1. Paul, I think your analysis is an excellent summary, and a great basis for discussion. I learned a lot. I am from South Australia and raised just 100 miles from where ediacara was discovered — and is I believe the oldest fossil on record.

    A few misc comments now. Your section on history of the Bible might be more balanced if you included the discovery of Sodom by Steven Collins, archeologist. In his book by the same name, he outlines how consistent the biblical story (in Genesis 19) is with archeology, with one exception: the timing is off, which he readily admits and discusses. This Bible story is about 1,700 years BC and over 1,000 years before the supposed editing/writing of the earlier Bible stories you mention. To me, this argues against the atheist position that all the Genesis stories cannot be dismissed as oral myths and legends grossly distorted over time.

    Second, your willingness to discuss with confirmed atheists is refreshing. I wish the other side were so willing. I clashed with the new atheists over what i interpreted as a health miracle due to God. First they criticized the medical result. When I presented the medical evidence showing that statistically it was a highly improbable result, they hammered me and my belief in God, even my scientific stature (I’m a Ph D in physics). This is despite many in the medical profession admitting to miracles, although they may not name them as such. These atheist’s belief is elitist in that they made clear I must be an indoctrinated confused idiot because I believe in God. Ironically, one of the reasons I cherish my belief in God and Jesus is because it is non-elitist. Jesus spent more time with the disenfranchised than with the intelligentsia.

    I look forward to more of your thinking.
    IanDexterPalmer.

    Like

    • I have allowed this comment in the interests of free expression but will not allow others (from any position) that deal primarily with the existence of God, the occurrence of miracles etc, as in my experience that leads to lengthy foodfights irrelevant to the original subject matter.

      Likewise, I do not want to go off topic discussing this or that specific Bible episode, thought I would agree that we know from other evidence that some of the events described in the Bible are directly or indirectly related to actual history in interesting ways. Accepting this obvious reality, like accepting the obvious reality of evolution, should not depend on whether or not one believes in God.

      Liked by 1 person

  2. There is one other approach to the Bible: The Bible has nothing to say about evolution. The Bible does not have the vocabulary to discuss the relationships between different forms of life, or the changes in life over space and time. Much of what creationists assert has no basis in the Bible. Much of what they deny, the Bible is silent about.

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    • I am a creationist who accepts Big Bang Theory and Theory of Evolution. For me creationism is a matter of faith–it answers the “Why?” question. Science, in my opinion, answers the “How?”

      I don’t believe that Genesis 1-3 was intended by the early Hebrews as literalist history or science as these two academic disciplines are understood today. Or as Dr Ken Miller aptly suggested, it would have left many people scratching their heads had God tried to explain DNA sequencing and genetic drift to a loose tribe of pre-historic semi-nomadic shepherds. They were not stupid people by any means, but human knowledge had not yet evolved to the point where our current knowledge would be understood.

      That being said, I’m not convinced that the Bible has nothing to say about evolution. Please note I am not claiming that it does. But neither am I convinced that it does not. Here I am speaking only as a private Christian theologian offering a personal opinion on the matter, but I believe that Genesis 1 implies or is at least open to the idea of evolution.

      It isn’t science as we understand science today, nor in my opinion is it necessary that the Bible imply evolution for either it or evolution to be true. (For example, it is also my opinion that the early Old Testament assumes a flat earth cosmology, which science has clearly demonstrated otherwise.) But the very fact that an omipotent God, who classical forms of Christianity believe exists in an eternal present, chose to call creation into being in several progressive stages over six days, that “roughly” corresponds to Big Bang Theory and Theory of Evolution, rather than in a single instaneous act, suggests to me that the ancients likely would not have been closed to the idea if they had access to the same scientific information we had today.

      Again, this is highly speculative on my part, but I think Big Bang Theory and Evolution are easily accommodated into Genesis’ creation texts.

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  3. Reblogged this on Peddling and Scaling God and Darwin and commented:
    Another interesting blog on creationism from Paul. I agree with most of it!

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  4. Interesting in both approach and detail. Thanks. But I am guessing you are somewhat generous in your assessment of those who pride themselves on being religious.

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    • There is no need for generosity; “those who pride themselves on being religious” include the geologist-historian-priest Michael Roberts, whom I have often quoted here, Francis Collins, Dennis Venema (one of my favourite expounders of evolution), and Ken Miller, who gave wonderful support for evolution at the Kitzmiller trial and whose critiques of Intelligent Design are classics of their kind. Check then out, especially Venema if you don’t know his work. You’ll enjoy the biology even if you find the apologetics irrelevant to you

      Liked by 1 person

      • Thank-you Dr Braterman for your generosity and for your class. And also for sharing good tips on how to explain Evolution and Big Bang theory to my fellow co-religionists with a more literalist understanding of Genesis’ creation texts.

        A big reason why practicing Christians like myself who accept evolution often avoid these types of discussion with fellow believers is because of the mockery and pile-on from anti-theists and Dawkinites over our faith. This just reinforces the stereotype of science as anti-religion among those whom we are trying to convince otherwise. Thus it is easier to simply tune out and dismiss both sides as too absorbed in their own ideology to really try and understand or learn from the other side.

        I cannot speak for other faith groups, however, the vast majority of Christians belong to denominations that accept (or at least don’t condemn) evolution. Christianity is creationist by faith; the Nicene-Constantinopolitan Creed opens with the proclamation “We believe in one God, the Father Almighty, Maker of heaven and earth, and of all things visible and invisible.” Nevertheless, it does not determine the means through which God used to create. Most Christians in my experience defer to science on this point.

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      • Peter, then you should be decrying your fellow Christians’ bad science and bad theology. This is where the problem lies; it would completely shut up the complaint from anti-religionists if Christians were to step up. I have seen strong condemnations of Biblical literalism and intelligent design by theologians, but they often get science wrong in the process; they seem to get confused that how they want to work isn’t how it actually does work.

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  5. A very wise procedure well thought out . We all have a tendency to assume anyone who does not come to our conclusions must be a moron. I have been called one many times and although I admit to not being highly intelligent I do not belong in the moron class.
    Intelligence is often misunderstood ; there are intelligent members of ISIS and our philosophy does not just depend on intelligence.
    The other serious mistake that many fall into is to assume those in past generations must be less intelligent than we are today.
    Obvious nonsense am I more intelligent than Newton ? or Euclid?
    It is one reason I don’t believe that the answer to the world’s problems is education, although education increases our knowledge not our intelligence.
    I’d interpret the Genesis story this way: eating of the tree of the knowledge of good and evil is becoming morally aware , the loss of animal innocence . I believe this is connected to self-consciousness and probably linked to the difficult problem of what consciousness is all about.
    If my conjecture is correct it shows that the writers of Genesis were smarter than we give them credit for.
    The other noteworthy thing about your approach is it encourages dialogue where as the Richard Dawkins method slams the door shut and that is the one thing we must not do if the world is to advance.

    Liked by 1 person

    • I like your interpretation. It connects the biblical account with the inevitable conflicts and dilemmas of morality and conduct, and woth how we evolved for a world very different from the world we now live in

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