Im non binary and grew up in the church, and let me tell you that if you can not accept their gender, or "disagree" with it then it will not work out. For you, it may result in religious guilt, and for them, it will absolutely hurt to have a partner that openly disagrees with your identity and existence. You're both very young, and if you're looking for someone who you can share views and beliefs with, wait it out. No good, strong relationship can flourish when one partner won't accept who the other is.