by jimwalton » Wed Aug 23, 2017 4:07 pm
Evolution is the model where all that is came about through genetic mutation (which has been proved to almost always be, and certainly strongly in favor of depreciation, not advance) and natural selection (which is blind, so "selection" is a bit of a misnomer. One way or another one continues on and another doesn't, but the "selection" process is not based in intelligence or reason). So we have several impersonal forces at work: mere chance (in chemical collisions, material circumstances, lightning strikes, temperature and velocity happenings, whatever), genetic mutation (a blind form of informational changes, almost always deleterious), and natural selection (some continue on, some don't). None of these processes involve intelligence or reason.
Out of this picture, naturalists claim, humanity evolved. But then naturalists assure us what evolved was an organism driven by survival: food, reproduction, fight and flight. There is no notion of "truth" in this equation, only what is and what isn't.
But we have cognitive faculties: perception, reasoning, intuitions, propositional thinking, abstract thinking, sympathy, introspection, memory, beliefs and knowledge. Let's examine this: My memory, for example, is reliable only if it produces mostly true beliefs. What's the good of it if it's detrimentally faulty? What percentage of my memories have to be true for me to consider my memory to be reliable? That's a judgment call, but I assume it would have to be better than 2/3 or 3/4. What about my other cognitive capabilities? They also have to be somewhat reliable (better than 75% or so) to be worth having. As a theist, it's easy to make this connection: God has made my faculties reliable. As a naturalist, though, you stand on much shakier ground: If your brain and thought capabilities are the result of accidents, mutations, and natural selection, on what group can you assume your power to reason is for the most part reliable? In other words, if naturalism and evolution are both true, our cognitive faculties would very likely not be reliable. The probability is low that I can depend on blind, non-reasoning sources to produce reason that is reliable. In other words, naturalism and science are in serious conflict with each other.
Thomas Nagel said, "If we came to believe that our capacity for objective theory (e.g., true beliefs) were the product of natural selection, that would warrant serious skepticism about its results."
Barry Stroud: "There is an embarrassing absurdity in [naturalism] that is revealed as soon as the naturalist reflects and acknowledges that he believes his naturalistic theory of the world. … I mean he cannot it and consistently regard it as true."
Patricia Churchland: "Boiled down to essentials, a nervous system enables the organism to succeed in the four Fs: feeding, fleeing, fighting, and reproducing. The principle chore of nervous systems it 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. Truth, whatever that is, definitely takes the hindmost."
In other words, without God, "the principal function or purpose of our cognitive faculties is not that of producing true or near true beliefs, but instead that of contributing to survival by getting the body parts in the right place. What evolution underwrites is only (at most) that our behavior is reasonably adaptive to the circumstances in which our ancestors found themselves; hence it doesn't guarantee true or mostly true beliefs. Our beliefs might be mostly true, but there is no particular reason to think they would be: natural selection is not interested in truth, but in appropriate behavior. What Churchland therefore suggests is that naturalistic evolution—that is, the conjunction of metaphysical naturalism with the view that we and our cognitive faculties have arisen by way of the mechanisms and processes proposed by contemporary evolutionary theory—gives us reason to doubt two things: (a) that a purpose of our cognitive systems is that of serving us with true beliefs, and (b) that they do, in fact, furnish us with mostly true beliefs." (- Alvin Plantinga)
Even Darwin agreed. "With me the horrid doubt always arises whether the convictions of man's mind, which has been developed from the mind of the lower animals, are of any value or at all trustworthy. Would any one trust in the convictions of a monkey’s mind, if there are any convictions in such a mind?"
What makes more sense is reasoning (intelligence in a being) had to exist in the beginning, and that intelligence was the first cause of the design we see in the universe, which has yielded beings who also have intelligence—reasoning powers that are reliable.