What do i do!?

My parents raised me in their church that says no dating until you're 16, and even then no steady dating...only groups. My parents KNOW i dont believe in their church. Then theres this wonderful guy ive known since i was little, and we found we care about each other a lot and started going out in october. We are so close now, and i cant imagine not having him in my life, but the problem is my parents just found out about it, and i dont turn 16 until march. Now they're trying to separate us and i dont know what to do. I've never felt such a oneness with anybody, and now i feel like i'm being ripped in 2 and my other half is being sent through a blender. Since i still live under my parents roof i have to abide by their rules, and i understand that...but how can i make them understand that their beliefs are not my beliefs and that i really do care about this guy? They're convinced its puppy love but they dont even take the time to let me explain it to them. What, if anything, can i do?