Touchy topic is touchy.
Anyways, I'm personally a non-religious person, because it seems ridiculous and far fetched that there could be anything supernatural out there (other than ghosts of course :P) so I guess you can I'm a rationalist.
If anything, I'd probably be a pagan, because that whole ideal really appeals to me, but if I was forced into a religion, it'd be the Celtic religion. Basically, their idea of afterlife is having sex, killing each other, and eating as much as you want. Those damn Celts had the best folklore.