That would explain a lot about islam - even just a casual read of the Koran makes it very plain that it is not consistent with itself.
Was Muhammad Insane?
THE FUNDAMENTAL PROBLEM OF ISLAM is the belief that God talked to Muhammad and dictated the contents of the Koran to him. Muslims are indoctrinated into believing this is so, and they act on the numerous incitements to violence that they find in it.
For insight into Muhammad’s mental condition, consider Chapter 33 of his Koran, entitled “The Confederates.” This is one of the chapters Muhammad composed in Yathrib (later called Medina) where he fled after his Meccan compatriots determined they needed to kill him to preserve their way of life.
The chapter is like a wild theme park ride that races in and out of numerous topics. In the 73 verses that make up the chapter, Muhammad covers the following in the God-voice he used for the Koran: He recaps a recent battle with the Meccans and excoriates people who were afraid to fight and die for him; he gloats about his extermination of the men and boys of one of the Jewish tribes of Yathrib, the confiscation of their property, and the enslavement of their women and children; he authorizes himself to take as many wives as he likes, permits himself to marry the wife of his adopted son, forbids himself from taking any more wives after he has taken as many as he likes, but allows himself sex slaves.
As the verses of this “revelation” continue, Muhammad imposes full body and face cover for women when outside the home, threatens people with humiliating punishment in the afterlife for annoying him, threatens to murder his critics, prohibits the practice of adoption, and dishes up images of sadistic torture in Hell awaiting people who don’t believe in him. He also praises himself as a “lamp spreading light,” and holds his behavior as a “beautiful pattern” for people to follow if they want to score well with Allah.
Overdue for a reformation. Christians did this a thousand years ago - time for the muslims to step up to the plate...