Jeeshway

I am currently dating a Non Member. I am in love with her. We've been dating for a really long time and know everything about eachother. She has made it clear that she doesn't want to join the church, but completely supports me to continue to be active in it. We've talked about things like marriage and children and tithing that would affect our relationship because of a religious difference. Idk if this is normally taboo for a Mormon guy like me to say but, I don't want to have kids. If I do, then I'll be happy with them, but... I don't plan on having any. And we talked about that as well and we feel the same way. Certain things I stay far away from for religious reasons such as drugs, alcohol, and pornography//bad movies , She stays away from for other reasons. Although anonymous I don't wish to share those reasons, but I know that she could/would never want to drink, or do drugs or anything like that. I want to marry her. And, we haven't tied any knots yet, but I know she wants/plans on marrying me as well. After reading some of the posts about things like this it seems like marrying a Non Member is some crazy sin. Is it really a sin? Also, I've always been taught that sex is between a legally and lawfully wedded man and wife. If we got married, though not in the temple it would be legal and lawful. So what's wrong with marrying her? I feel really good, and happier than I've ever been before when I think about marrying her. I have prayed about my relationship with her, and, all I can tell is that I'm happy with her. And honestly, I'd like to believe that later on in life she might want to be baptized, and if not I will still love her the same and be happy the same. I want to be with her, even if that means I can't make it into the highest part of the celestial kingdom.