It has been my experience that for the short term, BrianFantana is absolutly correct as are everyone actually who have responded to this subject.

What I have witnessed in the long term, when roles in marriage become more defined through responsibility and pressure, that many, many people which one would think could never retreat into a severly religious frame of mind, can.

I believe if anyone is going to be serious about a relationship, especially if it is going to eventually include children, make sure you can square your religious beliefs and differences with one another.

One story:

A friend of my wife's who was raised lutheran, but was not a religious minded person at all, years ago married a jewish guy whose family was quite faithful to their religious beliefs (but he said he was not).

It was love at first sight and all that jazz. They married quickly and she became pregnant soon after. Well, when the first christmass hoilday season was approaching they taked about how to celebrate. They were still infatuated with each other at this point and agreed to celebrate both holiday traditions.

The first 2 or 3 christmass' went well even though he was taking some heat from his family. Well after 2 kids and a few years, the husband dicided his boy's were going to be raised jewish, period. So he threw out all the christian christmass ornaments and laid down the law in spite of the objections from his partner.

Well, needless to say, that marriage went through some pretty hard times from that point forward. She resented him to no end for years. So, she cheated on him with many men and had not much nice to say about her husband to friends and family alike. And she was not able to hide her resentment very well before their children.