I was raised in a pretty fundamentalist Christian household. I would now describe myself as a 'Christian agnostic'; I don't know if God exists and doubt there is any way to know, but I still follow parts of the faith because I believe they make me a better person. It's just a long road you have to slog down. There's no good way to throw out everything all at once.

I would suggest you start by picking the single most important aspect of your faith, one that both says something about the divine (if it exists) and about what you're meant to do -- for me, it was "love your enemy". And then evaluate other parts of your faith based on that. You don't need to believe in the virgin birth to believe in the transforming power of grace. There's evidence for that aplenty.