The second last paragraph was the one which influenced me the most. Excellent point.

Personally, I am a very religiously versitile person, and I would have no problem in engaging in a romantic relationship with a person, no matter what religion, or lack of religion they have.

However, marriage is a very religious thing to some people, and and it may be against their religion to do stuff outside of marriage, and they might perceive an atheist marriage to be different in essence to a Christian one, for example, so, it wouldn't be okay to do that stuff, even if they are married, unless the marriage is Christian in essence. Romantic relationships are the road to marriage for many people, and if the potential marriage's essence wont allow these acts of ultimate intimacy, the romantic relationship may as well not exist.

I don't believe in any of that, and I don't know if anyone does, but I was just composing a possible reason for this relationship-religion divide.

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