rational naturalism is impossible!

[Rational AKD]

Wrong again. Natural selection does not equal survivability. Otherwise features that impair survivability wouldn't be chosen for and yet many of them are.

what features would those be?

The ability to perceive the truth does not mean the ability to perceive each and every aspect of the truth out there. To the extent that we do perceive the truth, it aids our survival.

not really. the only thing that is beneficial to survival is to behave in a manner that is better for survival. this does not entail true beliefs.

On the contrary, your ability to reason and use logic greatly aid your survivability.

not epistemological reason. not metaphysical reason.

As others have said, P2 is incorrect

I suppose they will have to take that up with Richard Dawkins then. he writes in The God Delusion "since we are creatures of natural selection, we cannot totally trust our own senses." Daniel Dennett in Breaking the Spell claims "people have theistic beliefs only because they helped our ancestors survive difficult times." if this apparently applies to theistic beliefs, why not naturalism?

Rather than simply render all knowledge useless, naturalism requires us to determine the probabilities of certain knowledge.

if our cognitive faculties are developed for us to behave adaptively, why would our ability to determine probabilities be necessarily accurate?