How do I choose sides? It's like God v. Devil.?

Idk if that sounded right. I'm fifteen and I try to be a Christian. My Dad is saved and my mom isn't. They're married and live I'm the same house. My mom drinks and my dad doesn't. Sometimes I feel like if I turn down something my mom wants me to watch or do or listen to I would be disappointing her. I really want to be how my Dad is but I feel like if I do something to please my momma I would be letting him down. I just don't want to watch Harry Potter and stuff...idk what to do. What can I tell them? I don't know what to do. Help eSe.