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!
I'm going to make a meta-comment here.
I think that your ultimate goal should NOT be to convince your dad that you are right and he is wrong. If he eventually changes his mind, he's going to have to do that on his own. Debates just don't change participants' minds very often.
Instead, your goal should be to make him respect your beliefs as genuine.
Christians generally respect people who are genuinely seeking truth, in part because the Bible promises that "those who seek will find". The good news is that you ARE legitimately seeking truth, so you should be able to convince him of this.
Hopefully you already have a good relationship with your father based on mutual love and respect. You want to build on that and preserve it as much as possible. He is going to be your dad for the rest of your life, and how you interact with him now is going to determine in part how that relationship develops.
More practically: It sounds like you aren't sure exactly why you've changed your mind, and are having difficulty articulating it. Nobody on this site is going to be able to articulate it for you. Rationality is a method, not a conclusion. So here is my suggestion: do a stack-trace on your change of belief. It happened, so it is causally entangled with some set of arguments and evidence you encountered. Go back and try to figure out what caused you to change your mind. Reconstruct as best you can, in your own words, as exactly and precisely as possible, why you changed your mind.
This exercise will help you to understand what you believe and why. Discussing this with your father will be grounds for a future relationship based on mutual love and respect. That should be the goal here.
Last piece of advice: spend some time with your dad doing something other than arguing. Go to a baseball game or something. Try to get some father-son time where you're not just talking about your beliefs. You want him to get used to the fact that you're the same person, and you don't want this to dominate your relationship.
On the other hand, I've seen Christians conclude that the fact that you haven't found Christianity is knock-down evidence that you're not legitimately seeking truth. One man's modus ponens is another man's modus tollens.