I probably would be making a big mistake to come out and then be wrong about it!
Though I have no expertise with your situation...
Don't come out, ever. I don't know of any heterosexual people who run around telling all their friends that they're straight. I really don't see the need for you to run around telling your friends that you're not.
Just go about your business as if everyone around you were also gay; would you feel a need to tell them then? In your very Christian family, I can see why this is a problem for you in that regard, but I would assume that your true friends, those you really should be concerned with keeping, will not abandon you nor view you differently no matter what your sexual orientation. You don't need to have a coming-out ceremony or anything like that; just mentioning it in casual conversation”while it will shock some”should be sufficient. Let's say they all want to hook you up with the hot new foreign exchange student... well, just tell them that you're into guys instead.
I think you're making a big deal out of something that is society's problem. I wish you the best of luck in making your mother understand, but that will only come with the passing of time. Don't let anyone influence you, not even from here, and just be you.
Jon
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