Where does the battle of demonic spirits start? Rebellion against God cost the devil his assignment. God cast down the devil from heaven and there he became satan. Jesus took authority over unclean spirits and introduced the ministry of deliverance to the church. Jesus demonstrated to us that through the power of God we can cast out demons. Jesus ushered in a new era. Jesus didn't just teach the kingdom of God, He demonstrated it. He taught, preached, healed the sick, and casted out demons. Demons recognize who you are and the authority that you carry. We were created to live in relationship with God and express His authority.