Some people believe that faith is specific to the individual and that organized religion is unnecessary. Jesus did preach individual relationships with God, but also in the context of the church being a body. We are all connected and need each other to survive spiritually. For those that try to "go it alone", Satan is just waiting to pick them off because they don't have the support and structure that is needed. God always planned for the church to be a family and support each other on our path to Heaven.