I'm so sorry this has happened to you It must be very hard to deal with.

Is there anyone in that group of friends you could approach by email, for instance, tell your side of things and ask why they are suddenly shutting you out? Tell them you can't think of anything you might have done wrong, and if there was something you would want to know and try to fix it. Maybe there's someone who's not as nasty to you as the others, or are they all completely united in their behaviour?

I ask because I think it would be fair of them to explain to you why they're doing this so you're not left wondering forever.. But it might well be they wouldn't give you any answers and asking would only make things worse

All in all I'd definitely say find new and BETTER friends, though I can only imagine how hard your life is what with you all attending the same church.. I would hate for you to have to find somewhere new because of THEIR appaling behaviour. If it was me, I might consider it though if things didn't get any better. There's only so much time I want to waste being miserable.. If nothing else worked, I'd probably just cut my losses and move on since there is no way we can change anyone else. But it would be hard I completely sympathize with you. Hugs!