1-800-656-HOPE is the national sexual abuse hotline. They're free and confidential and can point you to the resources that will help. Sorry to hear about your situation; clearly you're a young person of great courage to speak about it here.
To your question: I imagine that a fair number of young persons would become angry atheists, feeling that God abandoned them. A fair number of those persons would probably become Christians later; people who hate God don't make very committed atheists. (They have to believe in God to hate him, you see.)
I imagine that an abusive situation is like the elephant in the living room - no matter what spiritual path they walk, it's going to be about the abuse.