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Clearly this doubt arises for naturalists or atheists, but not for those who believe in God. That is because if God has created us in his image, then even if he fashioned us by some evolutionary means, he would presumably want us to resemble him in being able to know; but then most of what we believe might be true even if our minds have developed from those of the lower animals. On the other hand, there is a real problem here for the evolutionary naturalist. Richard Dawkins once claimed that evolution made it possible to be an intellectually fulfilled atheist. I believe he is dead wrong: I don't think it's possible at all to be an intellectually fulfilled atheist; but in any event you can't rationally accept both evolution and naturalism.
Why not? How does the argument go?[4] The first thing to see is that naturalists are also always or almost always materialists: they think human beings are material objects, with no immaterial or spiritual soul, or self. We just are our bodies, or perhaps some part of our bodies, such as our nervous systems, or brains, or perhaps part of our brains (the right or left hemisphere, for example), or perhaps some still smaller part. So let's think of naturalism as including materialism.[5] And now let's think about beliefs from a materialist perspective. According to materialists, beliefs, along with the rest of mental life, are caused or determined by neurophysiology, by what goes on in the brain and nervous system. Neurophysiology, furthermore, also causes behavior. According to the usual story, electrical signals proceed via afferent nerves from the sense organs to the brain; there some processing goes on; then electrical impulses go via efferent nerves from the brain to other organs including muscles; in response to these signals, certain muscles contract, thus causing movement and behavior.
Now what evolution tells us (supposing it tells us the truth) is that our behavior, (perhaps more exactly the behavior of our ancestors) is adaptive; since the members of our species have survived and reproduced, the behavior of our ancestors was conducive, in their environment, to survival and reproduction. Therefore the neurophysiology that caused that behavior was also adaptive; we can sensibly suppose that it is still adaptive. What evolution tells us, therefore, is that our kind of neurophysiology promotes or causes adaptive behavior, the kind of behavior that issues in survival and reproduction.
Now this same neurophysiology, according to the materialist, also causes belief. But while evolution, natural selection, rewards adaptive behavior (rewards it with survival and reproduction) and penalizes maladaptive behavior, it doesn't, as such, care a fig about true belief. As Francis Crick, the co-discoverer of the genetic code, writes in The Astonishing Hypothesis, "Our highly developed brains, after all, were not evolved under the pressure of discovering scientific truth, but only to enable us to be clever enough to survive and leave descendents." Taking up this theme, naturalist philosopher Patricia Churchland declares that the most important thing about the human brain is that it has evolved; hence, she says, its principal function is to enable the organism to move appropriately:
Boiled down to essentials, a nervous system enables the organism to succeed in the four F's: feeding, fleeing, fighting and reproducing. The principal chore of nervous systems is to get the body parts where they should be in order that the organism may survive … . Improvements in sensorimotor control confer an evolutionary advantage: a fancier style of representing is advantageous so long as it is geared to the organism's way of life and enhances the organism's chances of survival [Churchland's emphasis]. Truth, whatever that is, definitely takes the hindmost.[6]
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