I've never been religious as in I never went to Temple much when I was younger. We celebrated Hanukkah, Rosh Hashanah, Passover, etc. but it was more of a family get together then us doing any religious aspects.
My boyfriend was raised in a Catholic home but, like mine, his family was not religious.
It's never been an issue in either of our families to find "a nice Jewish boy" or "a nice Catholic girl". My parents have said that they prefer I date a Jewish boy but as long as I've found a guy who has other wonderful qualities than it's ok. My mother has always said that my current boyfriend is exactly who she would want her daughter to date except that he's not Jewish.
We've discussed marriage and children. My religion, per se, is not as important to me as the cultural aspects behind Judaism. As many others have stated, Judaism is more than just a religion. My boyfriend and I have agreed to have a Jewish wedding. When we have kids, they will be raised as both religions but I will probably teach them more about Judaism. They'll be taken to Temple occasionally and they'll learn about the history. They'll also be given Hebrew names.
Also, according to the Jewish religion, your children are the religion of the mother.