Around 325 Anno Domini, at a secret meeting in a dark room in Rome, a “trinity god” had been ordered into existence. This invention was finalized at the Council of Nicaea. Henceforth, throughout the Roman Empire, “trinity god” was the law. Accept “trinity god” – or else!
Some who did not agree with the “trinity god” concept fled eastward, beyond Roman control. There, various conceptions of the deity lived side-by-side, in peace.
These “heretics” – followers of Arius, the Ebionites, the Nestorians, the Docetes, and others – lived in exile for many years. Into this wilderness of exiles was born Muhammad, in Mecca, in 570 A.D. Traveling as a caravan leader, the deeply religious young man came in contact with various of the “heretical” ideas. The Nestorians, for instance, would have told Muhammad that God is not a Trinity but that Jesus had been two persons: the man Jesus and the divine son of God. Remnants of the Ebionites would have said to Muhammad that St. Paul had been an apostate from the true faith and that Jesus had been misrepresented.
Pondering these questions, Muhammad was visited by the angel Gabriel who informed Muhammad’s understanding. Gabriel apparently told Muhammad, “And your Allah is One Allah: There is no god but He, Most Gracious, Most Merciful.” This was written in a holy book called the Koran. According to Edward Gibbon, writing in Decline and Fall of the Roman Empire (volume 5, chapter 50), the Koran is said to be “uncreated and eternal; subsisting in the essence of the Deity, and inscribed with a pen of light on the table of his everlasting decrees. A paper copy, in a volume of silk and gems, was brought down to the lowest heaven by the angel Gabriel, who, under the Jewish economy, had indeed been despatched on the most important errands; and this trusty messenger successively revealed the chapters and verses to the Arabian prophet [Muhammed].”
As if a great light had shone upon him, Muhammad arose and proclaimed, “There is no God but Allah!” This was a huge revolt against the “trinity god.” Inspired by the message of their prophet, the Muslims took sword in hand and rushed westward. Their army crossed northern Africa and chased away “trinity god.” The adherents of the one God continued on into Spain. The terrified “trinity god” could not run fast enough in its retreat from the one God!
You can see by this how the invention of “trinity god” led to the reaction of Islam. (And maybe the one God, appalled at the invention of the false “trinity god,” really did send the angel Gabriel to Muhammad to inspire combat against the wrong idea.) A further decline in Christendom came when the presumed vicar of “trinity god,” Pope Urban II, declared the “Christian” idea of “Holy War” to be an accepted part of the creed. See how the original, true Christianity kept declining: When one of those who were with Jesus had taken a sword and cut off the ear of the servant of the high priest, Jesus had said to the swordsman, “Put up again thy sword into his place: for all they that take the sword shall perish with the sword.” (Matthew 26: 52) And yet now the Pope of “trinity god” had overruled Jesus!