Come out of the closet. It's dark and scary in there. Walk into the light. Accept yourself. If there's a God, he made you the way you are for a reason. Deal with that.
If Christianity is important to you, keep it. There are other varieties out there aside from fundamentalist Christianity. It's obvious one thing about you has to change. I'm not a psychologist, but my guess is it's a heck of a lot easier to change your religion than your sexual orientation.
Amen Morbo, Amen!