Your dad shouldn't be a pastor spreading such controlling hatred. My grandpa went to his pastor when I came out, and thankfully his pastor actually follows their own damn religion and taught love and acceptance. What ever happened to "love thy neighbor", anything about loving " sinners" for otherwise you are one yourself, or just... Supporting people? You're not doing them or anyone any harm. I really hope your dad can be excommunicated for this... I don't know much about religion though... Beyond the intense amount of bloodshed and hate its historically caused.

Girlie, they can't take who or what you are away from you. I'd take the advice of other commenters here... Low contact at most until they've taken the sticks out of their asses.