If anyone could argue me out of my agnosticism back into the Faith by negative example, it would be John Derbyshire. What a shallow, cretinous fool. "Mysterian" my arse - if you want to totter through life a deist, use the proper terms. His reasons for losing faith are variously foolish (human minds being wired for religion is an argument neither in favor of, nor in contradiction to, the propositions of any particular religion) racist (blacks are religious! east asians aren't! I hates me some blacks, and love those Chinese!) and ignorant (dur, never did understand biology, but now's I've been edujumicated on my Darwin, I sees as how religion is bunk!).
I mean, he's still more religious than I am, even on a good day, but I can't help but feel contempt for his irreligiosity. And I suppose you can't possibly find a better argument for man's essential irrationality than that admission right there. Or at least, my essential irrationality.