God made the angels. A spirit , a being that has understanding and free will, but no body and will never die. Demons are pure spirits Even devils do service to God, since God always turns the attacks of the devil to show forth more brightly His own glory or to punish sin, convert sinners, or provide some means for the practice of virtue. God permits us to be tempted or order to try us, to let us win an eternal reward. (My Catholic Faith)