I'm agnostic. I've considered many other views (particularly Hinduism), but just haven't seen a rational reason to be religious since I was 7. However, I'm okay with being with a religious girl. Hell, I can even see the social advantage our children would have if they could relate to the majority of America.
Of course, I would prefer to marry an agnostic or at least a girl who is willing to say "I hope there's a heaven, but we can't know for sure." I think the biggest thing is not avoiding a certain religion, but traditionalism-for-its-own-sake and closed-mindedness. Being rational is key and applies to much outside of church and holidays.