As long as the music is good, I don't care. Some great bands have come from religion/christianity, from both a positive or negative influence.
I personally don't conform to any particular religion myself, but they (excluding scientology) are, and will only continue to be, a great source of inspiration and each of them, including Christianity, have some incredible history and stories worth reading up on.
That said, I can't wait for the anti-scientology wave of bands to surface!
Yesterday don't mean SHIT.