Saying people should not be part of the Church because of some of the terrible things done by church people is like saying marriage should be done away with because some marriages are terrible. Or cars should be banned because some people drive recklessly and kill with their cars.
It is sad that people say and do terrible things in the name of God, but we can’t blame God for that. Some people take certain verses of the Bible or the Qur’an out of context to justify breaking the laws of their own religion. They ignore the peaceful teachings of their religions because their hearts are evil.
We have free will. God doesn’t control us like we are puppets. God will guide us if we pray for guidance, and submit to God’s will. God has given us teachings and principles to live by as well. If you look at the Ten Commandments, for example, they are the way to a peaceful and orderly society. Our western legal system is based on those Ten Commandments because they are universal principles found in most religions and societies in some form or another.
So don’t let the actions of some keep you away from God. God loves you and wants you to be in relationship with him. Not because God needs you, but because you need God.