I grew up in church and I would say:
1. The shit is easy to fake if you're of that disposition - I knew a guy who might as well have worshipped Satan, but he acted like he loved God when he was at church and that was enough for most people.
2. If you do fake in order to get laid, you WILL cause serious upset and it may hurt your reputation in the long run. A lot of girls in church are very naive and if you're seen to take advantage you will be considered a c**t (although they wouldn't use that word obviously).
3. Chances are it'll be very hard getting to that stage anyway - most of her friends will be cockblocking you and if she does go some of the way she will probably be hesitant and make both you and her feel awkward. As others have said, there will be some who are DTF but they're not really the average church girl, and I'm trying to give you the best advice based on the average situation you'll encounter.
4. As Lockdown's already said, if you're looking for a relationship you'd be a fool to try and fake who you are to get it - that shows no respect for you or the other person. I wouldn't even think about going there.
5. A point about churches and religious cults in general - the friendship they often appear to offer may be cynically motivated. They may want you as a convert, so don't mistake this for genuine kindness.
Apart from all those caveats, yeah great dude, knock yourself out!
