However, if we can't trust our belief-forming faculties to tell us the truth about God, why should we trust them to tell us the truth about anything, including evolutionary science? If our cognitive faculties only tell us what we need to survive, not what is true, why trust them about anything at all?
Rewrite the paragraph; but remove all unnecessary particulars and emotive words, leaving the propositions in the abstract:
... if we can't trust our beliefs ... to tell us the truth ... why should we trust them to tell us the truth ...? ... If our cognitive faculties ... only tell us what we need to survive ... not what is true ... why trust them?
The first proposition reduces to an entirely meaningless tautology. The second proposition implies that truth is something other than what we need to survive. Together, the propositions ask the question: In what contexts can we trust our beliefs?
These abstract forms of the propositions, expose the issues under discussion: What is belief? To what extent can we trust our beliefs? These issues have been the subject of much discourse and quite a number of wars, genocides, and such like; over the past few thousand years. Although there appears to be no convincing philosophical argument either way, historical and palaeontological evidence suggests that species and cultures unable to adapt, do not survive. In the human cultural context, these issues have been explored by Jared Diamond.
The evolutionary source of empathy appears to be our mirror neurons, you may follow the research from the work of V.S.Ramachandran, outlined here, and from this video.
Here are a few pointers to philosophical arguments that might expose fallacies in thinking.
Beliefs may be classified into two types:
The former type, are those beliefs that I must have; for example, if I do not believe the doorway is where it is (my map does not correspond to the territory), I will likely walk into the wall. These types of beliefs are necessary for my survival.
The latter type, are those beliefs that I choose to have; these beliefs express my preferences and values; for example, if I prefer to eat chicken than pork, and am offered an option, I will value a bowl of chicken more than a bowl of pork.
Preferences are contextual: if I am offered no choice, and have the option of eating pork or starving; then my preference for chicken may compromise my survival. If my preference for chicken prevents me from eating pork, and I subsequently die; my unshakeable preference for chicken will die with me.
I consider that the above illustrates that only the former type of belief will survive in the long run; which answers the question by inference.
Provided that one person feels that their preferences were freely chosen; then, what justification is there for denying another similar freedoms? If someone asks: Do you believe in God? - answer: Do you believe in a god? If their answer is in the affirmative, one can then answer in honesty: I believe that you believe in a god? This becomes a little tricky if someone asks: Do you believe there is only one God? Then one must find at least two people to respond in the affirmative, before one can answer in honesty: No (the burden of proof falls to them, if they wish to claim that these are one and the same god.)
For those of a more philosophical temperament, this paradox sometimes suffices (or failing that, invokes a perplexed expression):
For some 'thing' to exist; that 'thing' must first be recognized (there can never, therefore, be only one instance of any 'thing'.)
This works for any ideal (universal), but can be applied to the concept of 'god', as easily as the concept of 'chair' or 'unicorn'. It makes no sense to ask: Do you believe in the existence of 'chair'? For the question to have sense, one must ask in the particular; Do you believe in the existence of 'that chair'?
These are all plays on words, and I for one, have never really understood the difference: a 'believer' claims to believe in one 'unicorn', and a 'non believer' claims to not believe in another 'unicorn'. This confuses me; if pressed, I prefer to label myself 'apatheist', I really do not see that this kind of belief makes any difference either way: https://en.wikipedia.org/wiki/Apatheism
So, a little background- I've just come out as an atheist to my dad, a Christian pastor, who's convinced he can "fix" my thinking and is bombarding me with a number of flimsy arguments that I'm having trouble articulating a response to, and need help shutting down. The particular issue at the moment deals with non-theistic explanations for human psychology and things like love, morality, and beauty. After attempting to communicate explanations from evolutionary psychology, I was met with amused dismissal of the subject as "speculation".
There's one book in particular he's having me read- The Reason for God by Timothy Keller. In the book, he brings up evolutionary psychology as an alternative to theistic explanations, and immediately dismisses it as apparently self-defeating.
"Evolutionists say that if God makes sense to us, it is not because he is really there, it's only because that belief helped us survive and so we are hardwired for it. However, if we can't trust our belief-forming faculties to tell us the truth about God, why should we trust them to tell us the truth about anything, including evolutionary science? If our cognitive faculties only tell us what we need to survive, not what is true, why trust them about anything at all?" -Timothy Keller
The obvious answer is that knowing the truth about things is generally advantageous to survival- but it hardly addresses the underlying assertion- that without [incredibly specific collection of god-beliefs and assorted dogmas], human brains can't arrive at truth because they weren't designed for it. And of course, I'm talking to a guy with an especially exacting definition of "truth" (100% certainty about the territory)- I could use an LW post that succinctly discusses the role and definition of truth, there.
Another thing Dad likes to do is back me into a corner WRT morality and moral relativism- "Oh, but can you really believe that the act of rape doesn't have an inherent [wrongness]? Are you saying it was justified for [insert historical monster] to do [atrocity] because it would make him reproductively successful?" Armed only with evolutionary explanations for their behavior, I couldn't really respond- possibly my fault, since I haven't read the Morality sequence on account of I got stuck in the Quantum Physics ultrasequence, and knowing that reality is composed of complex amplitudes flowing between explicit configurations or aaasasdjgasjdga whatever the frig even (I CAN'T) has proven to be staggeringly unhelpful in this situation.
In addition to particular arguments WRT the question posed, I could also use recommendations for good, well-argued and accessible books on the subject of evolutionary psychology, with a focus on practical experimental results and application- the guy can't be given a book and not read it, so I'm hoping to at least get him to not dismiss the science as "speculation" or a joke. It's likely he's aware that the field evolutionary psychology is really prone to hindsight bias and thus ignores it completely, so along with the book, a good article or study demonstrating the accuracy and predictive power of the evolutionary psychological model would be appreciated.
Thanks!