Regarding the issue of the Quran, I recently ran across a short passage that would seem very logical. It is interesting to note that many muslims seem to believe that the prophet was "infallable" However there are a few nagging questions about islam. .
The issue of those pesky "satanic Verses," of which an account can be found in: An extensive account of the incident is found in al-Tabāri's history, the Ta'rīkh (Vol. I) (A broad account can be found here: http://en.wikipedia.org/wiki/Satanic_Verses)
The Islamic festival of Eid al-Adha, which celebrates God preventing Abraham from sacrificing his son, and the Koran itself, may reveal the true origin of the Islamic Koran. The Koran teaches that Satan tricked Abraham into offering his own son as a sacrifice to God. (Q, 37:107) In the Koran, it is taught that God chastised Abraham for not recognizing Satan’s attempt to impersonate God: “You believed the dream…God never advocates sin”. (Q, 7:28) Ironically, the Muslims believe that it was Gabriel who, at the last moment, substituted Abraham’s son with a lamb and thwarts Satan’s plot against Abraham. The Koran, therefore, makes it clear that Islam teaches that Satan can even trick God’s greatest prophets. If one were to be undiplomatic, it could be speculated that the role of Gabriel, as the messenger of God to the prophet Mohammed as elucidated in the story of Eid al-Adha, could be an allegory for the true origin of the Koran.
Interesting quetion and point, which deserve to be addressed.