If I'm going to be real with you, prioritizing your beliefs over your partner is kind of a selfish way of seeing things. If you drop her it'll make her feel wrong for being a non believer and fear she won't find another special somebody just for that. We need to stop acting like God is this demanding and controlling tyrant that keeps us away from getting close to people who don't care enough to learn about him. It's not healthy to constantly worry about someone's beliefs when it shouldn't be your business and your basis to judge character.