I agree that Islam has little to do with G-d.
Islam was not founded by Mahomet, except in retrospect. The Qu'ran was not written until many years after his death. It was written to conform with the desires of his successors. Those successors tried to design a middle place between the Law if Israel, and the Grace of Christianity that would attract both. They supported pilgrimage to gain the cooperation of the various pagan pilgrimage sites. Even circumcision is between the practice of the Jews and the uncircumcised Christians.
The problem now is with the Hanabi school which declares all statements false which are not based on the Quran and Hadith. This locks that view deep within the Dark Ages. Hanabi school didn't matter much when it was locked deep within the depths of Arabia. When it took over Mecca and Medina, and got the funding of too too many petrodollars, they were able to spread their heresy.
No Islam is true to itself that does not include the mysticism of the Sufi, just as Christianity can not be understood without the influence of Irish Monastisism.
The problem was with Caliph Uthman (I think it was he, it may have been with the Caliph after him), who was corrupt, greatly favoring his own tribe, and was murdered. Those who supported Ali were complicit in the murder. Those who opposed Ali were complicit in corruption.
At that time the Catholic Church had also taken the broad road to hell called "established church". It is my personal belief that to the extent that the Revelation of John was prophetic, it referred to Constantine as the Antichrist. Constantine corrupted the church, and set up the church for every single doctrinal battles that followed by backing orthodox doctrine with the power of the Roman Army. Heresy became treason, and schism became rebellion. Rather than have religion be a matter of faith, and debate, it is fatally mixed with politics.