It is behavior like your parents that reinforces the conviction of atheists. They're supposed to be "good, Christian people", but they ostracize you if you exert any form of will independent of theirs. The Bible even says to KILL disobedient children:
Deuteronomy 21:18-21 King James Version (KJV)
18 If a man have a stubborn and rebellious son, which will not obey the voice of his father, or the voice of his mother, and that, when they have chastened him, will not hearken unto them:
19 Then shall his father and his mother lay hold on him, and bring him out unto the elders of his city, and unto the gate of his place;
20 And they shall say unto the elders of his city, This our son is stubborn and rebellious, he will not obey our voice; he is a glutton, and a drunkard.
21 And all the men of his city shall stone him with stones, that he die: so shalt thou put evil away from among you; and all Israel shall hear, and fear.
But I've got some fantastic news for you. They legally can't turn you out at 16 without paying to legally emancipate you. If they do, turn them in to the police. That is child endangerment and neglect.
If your terrible sperm and egg donors only love you as long as you obey them, then they never loved you to begin with. They love to be obeyed. Well, give them a taste of their own medicine; they have to obey the law, so bring in a real higher power. And if bad comes to absolute worst, they will take you out of that terrible house and help you find a new family.
I know it is hard, but stop being afraid of your parents, that is part of how they've been controlling you. Never allow anyone or anything to stifle your will to live happily; not family or friends.
If you ever need to vent or just talk, my inbox is always open.