What would you do in my situation?

First of all, Aww I'm so sorry. And second of all I'm really christian too and my parent's went through the same thing. But you have to ask yourself, Do you love her? Do you want to be with her for the rest of your life? And i definatley would repent and ask God to take away your sins. But I think it's really ridiculous that her parents did that. And if you do love her...stay with her. Because i think you can both change your life around. And if she loves you enough to stay with you then I would hope that someday her parents can come to see that you guys really love eachother and God loves you too and that God forgives just like they can. :] So I hope this helped. And i really hope this all works out. I'll be praying for you :]