God comes to restore not destroy
Jesus did not come to destroy the man with the unclean spirit. In so doing Jesus would have destroyed the unclean spirit and the man who was held captive by it. God could very well destroy our whole body and life. He would be fully justified in doing so. It is in our sin that God could easily have nothing to do with us, as we so often want nothing to do with Him. But Jesus, in Holy baptism, comes not to destroy the whole us but to clean and restore us. Our one Baptism daily has a new man emerge and arise in us to live before God in righteousness and purity forever.