How is it that I keep failing to recognize your version of what I'm saying? Millions of people call themselves "Christians" but do not adhere to the letter of the Bible while others do--they are called fundamentalists. Likewise not all Muslims adhere to a literal translation of the Koran, while others--called "FUNDAMENTALISTS"--do. How is it that you can't grasp the concept that religions evolve into various sects that follow their sacred writings in varying degrees and in some cases, such as Protestant liberals, virtually not at all. Hence Catholics, Lutherans, Presbyterians, Methodists, Mormons, Unitarians etc.
In Islam varying interpretations have led to Ahmaydia, Alawi, Druze,Ismali,Nation of Islam, Salafy, Shia, New Sufi,and Wahhabi Movements. Clearly when it comes to doctrine, Islam is no more monolithic than Christianity. Some of these sects take every word of the Koran literally while others have more nuanced interpretations. Perhaps Muhammad is rolloing over in his grave, but there it is.
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Because you are determined not to. You have some kind of investment in this thing which blinds you.