Then again, a Christian marriage is one considered unity by God. So if someone doesn't believe in God, would that not prove a problem? A genuinely loving relationship could still be maintained, but as far as marriage goes, it all depends on what you view marriage is or should be and whether or not it is religious. I still believe in love no matter who it's between, and no, I don't think religion should get in the way of any relationship.

And Hombre de Mundo:
I'm only pointing out my opinion. I know this isn't exactly what you meant, but if I had to choose between a happy healthy relationship now over an eternity with love...I choose the latter.