What kind of spirit was really working behind the "prophet" Muhammad that roughly 1.9 billion people follow? This e-book examines the idea that Muhammad was demon possessed, as many of the authentic and authoritative Muslim texts suggests. We will also examine if the entity, the angel Gabriel (Jibril), Muhammad believed communicated through him was really a fallen angel or demon. The e-book also explores Muhammad's very questionable morality. Would God, who is righteous and holy, work behind a person who sanctioned and committed many evil and atrocious acts, such as child marriage? Muhammad affirmed the Bible, but the Bible warned about the preaching of another Jesus and another Gospel, which Muhammad did. If God (Allah) really communicated to Muhammad via the angel Gabriel, then why did God give contradictory revelation? This e-book has a wealth of evidence that Muhammad was indeed demonically influenced and thus shouldn't be trusted as a true prophet of God.