It sounds as if your dilemma goes beyond religious differences so I'll dispense the advice I give all young people feeling their 'wild oats.'
When you first meet someone, you really know very little about them, so you fill in the gaps in your mental picture with what you WANT to see without even realizing it. If the resulting idealization appeals to you, you feel attraction.
They call this 'infatuation' and it passes once enough of the idealized suppositions you have made are replaced with reality; what takes the place of infatuation may be real love based upon an honest assessment, or might be more averse.
Since you are so young, you must be careful because you have all these hormones rushing through your blood that magnify your every emotion beyond reason that very much like being on drugs.
Infatuation and hormones make you act like you are stoned out of your mind.
Then you begin engaging in physical intimacy, kissing and such, and you lose any residual objectivity you might have retained.
It makes it all to easy to excuse traits that would ordinarily repel you and creates a false intimacy that can seem like a connection of long-sundered souls.
Then one day the hormones have died down, the infatuation and idealization is replaced by harsh reality, and you wake up next to someone you can't stand on a Sunday morning early to go to the meeting of the doomsday cult and pray the Big A comes before you have to struggle through another mind-killing controltower study.
Are you infatuated? Let's see...
"I am all full of doubt and am considering signing my life away to the GB because I can just feel SHE'S THE 'ONE' FOR ME!"
Yup. Let me guess, she is the prettiest, smartest, and you just can't imagine you guys will ever fight, right?
So was the hog I married the second time. and the GF after her that made me wanna gargle with bullets.
I don't know if you will be able to take this next bit of advice, but I proffer it just in case.
A wise person guards their heart, you can only offer bits of it to so many people before you're left with an empty space.
Learn to recognize the heady rush of infatuation for what it is, and don't give in to the drugs your body is pumping into your blood just yet. Make friends and hold off on the kissy talk until you see them for who they are.
That way you can still back away from stalkers, cultists, or emotional black holes without a painful break-up driving you straight into the arms of the next train wreck.
Well, there's my advice, take it or leave it, but in any case; Good Luck!
(Oh, BTW, if you sign on to the witlesses, you can never say or accept wishes of 'good luck' again)
Roller