I've met a couple (I'm up in Sheffield, student there.), both of whom wee quite strict Christians. (Although one did have a 'well, when I say sex, I mean intercourse, y'know?' attitude.) But yeah, it's pretty rare on this side of the pond.

For me, it fitted with her religious beliefs and her emotional reticence in the early part of the books, but now her new religion seems to be herself. I know your body's supposed to be a temple and all, but most of us don't have a congregation worshipping there :)