Enemies? Enemies are fair game? What church, or what Christ, or what God has any enemies if we all are one?

Satan is the enemy of all. He has been the enemy of righteousness since before the Earth was created, and will be until the end of time as we know it. We are saved from Satan's evil by God's grace. God spoke about the light and the darkness (as the world was being formed) in the first chapter of Genesis (first book in the Bible).