Book excerpt: Denying Jesus Christ, the Son of the Living God, is the greatest mistake the entire world has made in the past and present and will continue to make in the future. Without Jesus Christ as Lord and Savior in one's life, how can a person live coexisting with spirit beings known as demons, wicked spirit persons who have inhabited the earth the entire time mankind has been on earth? Yet the world lives as though we don't coexist with spirit beings, and to reject or deny the only person whom these spirit beings obey is like living without a cause. People, the world in general, it's imperative to acknowledge that demon spirits have invaded human bodies. Demonic forces, whom we can't see nor control, are in control of multitudes of human lives, which have persons in spiritual warfare with invisible demons as enemies in mankind and fighting a battle within themselves and against others like themselves. These demons, which are also named evil spirits, are in human bodies as demon control spirits, sometimes called devils as they became dominant spirit forces. Demons have been assigned to us in the body of humankind to harm, kill, and destroy lives by any means. Demons have been assigned to our children to possess as their own to harm, steal, or destroy lives and family livelihood. The power of Jesus Christ's name provides protection for all mankind in the spirit realm, believers as well as nonbelievers.