One really cannot in good conscience look at an intellectual system that produced fruits as varied and wild as Augustine and Kirkegaard, then turn away and look at an asshole like Jerry Falwell and go "Yeah, they're all a bunch of bigoted morons." When you confront one of the most venerable and influential intellectual and philosophical doctrines in human history, you'd better be prepared to go toe to toe with the shades of Aquinas and Dostoyevsky in defense of your skepticism of the fundamental bedrock of their worldviews. None of the men I mentioned really strongly agreed on many moral or philosophical points and yet they all shared a fundamental belief in Christianity that should make you consider that, even if (like me) you don't share that belief, that there's something pretty compelling and rich intellectual soil in that direction and that you shouldn't just brush Christians off as ignorant rubes.
As an aside, that was something I found really annoying about The God Delusion. There was a small bit on Aquinas and nothing on most other major Christian intellectuals... but Tim LaHaye gets discussed