I always find the Judaism in his books really interesting, and he makes it sound quite whimsical, which I'm sure it's not completely (but Catholicism can also sound really esoteric and stuff, and then actual thing - eh, isn't), but I like it. I'm sure a lot goes over my head, because I've never really hung out with someone Jewish in RL, just online.

I really do love the way he writes, though. He has a way to make you feel for the characters, Wonder Boys excluding, lol.