I met this one girl a few years ago and fell in love with her almost immediately. She was always outgoing and kind, and outrageously good looking. But more importantly, I saw an element in her personality that no one else that I know, has. And I loved it. I felt that pursuing a relationship with her would have been remiss, however, given that we share different religious beliefs.
I also assumed that I would find someone who was more attractive physically and in personality, and share my beliefs. But I still have yet to meet anyone other than her that I find attractive, and the more I try to stop thinking about it, the more lonely and frustrated I feel. I thought that I would just have a crush on her for a few weeks, and forget about her, but thinking about not having her has become a living nightmare. I can’t stop thinking about her. This has been going on for three years, and is quickly becoming an obsession. Any advice would be deeply appreciated.
LemonVibe 
Ask her out.
Well, one, discuss your feelings with a counselor (“religious beliefs” is pretty vague, but if you’re on the in-side, that includes a pastor, rabbi, etc. Practicing therapists are an option, too). I don’t mean forever — just like, six or seven times. It’s nearly impossible to break an obsession yourself, and I suspect if your friends were going to help they already would’ve.
Two, loosen up. Date someone you don’t intend to stay with. I was raised Protestant Christian and there was always this bullshit going around about not “yoking an ox and a bull,” and suspicion about dating in general. But I didn’t know what I really wanted in a partner until I’d made a few mistakes. Learning from those mistakes made me a better person (although I felt pretty shitty at the time). It isn’t a perfect world and you can’t be a perfect person… but you can’t even find the path unless you go looking for it.