Timothy Keller's argument becomes absurd when you reduce "cognitive faculties". Evolutionary psychology doesn't tell us not to trust our faculties at all (or he's correct, it would be self defeating). Rather it tells us to be wary of specific cognitivve faculties.Those of us claiming sanity make the assumption that our basic logical faculties are the most reliable (even those of us who believe in belief). Communication would be futile otherwise. Reason can be used to debug higher order functions that deliver conclusions to us wholesale - such as the intuitions telling us that God exists. And part of the means to carry out this debugging is to analyze them with evolutionary psychology.