RCTjunkie, you didn't tell us your friend had a VGC account.

Senior year being current, and the end of highschool being imminent?

I'd say tough it out for three months and then let the relationship wither as most high school relationships (friendships and romances both) inevitably tend to do after graduation. If there's a light at the end of the tunnel, pursue it instead of creating conflict

Unless she's intimately linked to your circle of friends. Then there could be an issue

i am not really religious, far from it but was that really neccessary?

So, you turned a girl into a lesbian.
Achievement unlocked.

I'm no expert, but I'm fairly sure that's not how religion works.

Make fun of her for being lesbian since she messes with you about being Christian.

That would be very wrong for several reasons.

No more like in a funny way, for maintaining a healthy friendship.

Ah, excuse me, i thought for whatever reason that this was not good-natured ribbing. If it is, then that's a perfectly acceptable comeback.

Oh ya it is a good natured thing like for example, me and my friends may make fun of each for our beliefs or girls we may like, but it's in a healthy funny way. Sorry for the misunderstanding!