Indeed Geber did likely write also in Arabic, though probably not the same classical form, but nevertheless perfectly readable translations are available to the curious infidel.
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I did not say the Koran was unreadable, I said it is written in gibberish, and much of it makes no sense. There is also the fact that it s arranged in a very curious way, starting with the shortest verses and proceeding to the longest. If one arranges any book like this, I think it will seem incoherent.
Pedophilia was common in Mo's time, but it surely was not acceptable to everyone. I think it is natural for a father to resent some ancient dude having the hots for a six-year old daughter, even if everyone accepts this as "normal" for ancient dudes.