Agnostic and Christian relationship help?

My girlfriend and I have been dating for more than five months now. Two days ago she called me and broke up with me because I'm agnostic. She is a bible thumper, her dad is a pastor and she goes to church every Sunday and Wednesday. (shes southern baptist.) I can honestly say I love her. Everything about her is perfect for me and we never fight. I have absolutely nothing against her religion and i completely respect it. She however wants me to convert so we can still date. I try and tell her that i wont change her faith and we never have to speak of religion. She says she is afraid she will get led away from Christianity if we continue dating. Please help. I want her back so bad.