He encontrado un resumen del libro The Origins of the Koran, que reseña una serie de ensayos clásicos sobre el alcorán, su autor es el apóstata Ibn Warraq.
A diferencia de Talmud o de la Biblia los mahometanos pretenden que el alcorán es un libro cuyo original está en los cielos desde siempre y que fue soplado a las orejas de Mojamé por el arcángel Gabriel/Gabirol.
According to the traditional account the Koran was revealed to Muhammad, usually by an angel, gradually over a period of years until his death in 632 C.E. (…)
Extraigo dos objeciones al respecto. La primera dice que es demasiado largo para memorizarlo:
When listening to these accounts, some very common- sensical objections arise which no one seems to have dared to ask. First, all these stories place an enormous burden on the memories of the early Muslims. Indeed, scholars are compelled to exaggerate the putatively prodigious memories of the Arabs. Muhammad could not read or write according to some traditions, and therefore everything depends on him having perfectly memorized what God revealed to him through His Angels. Some of the stories in the Koran are enormously long; for instance, the story of Joseph takes up a whole chapter of 111 verses. Are we really to believe that Muhammad remembered it exactly as it was revealed? (…)
La segunda se refiere a que se nota demasiado que es un refrito de diversos cálamos:
The Christian al-Kindi (not to be confused with the Arab, Muslim philosopher) writing around 830 C.E., criticized the Koran in similar terms: «The result of all this (process by which the Quran came into being) is patent to you who have read the scriptures and see how, in your book, histories are jumbled together and intermingled; an evidence that many different hands have been at work therein, and caused discrepancies, adding or cutting out whatever they liked or disliked. Are such, now, the conditions of a revelation sent down from heaven?»
Todo el artículo es interesante. Imagino que aún más el libro de Ibn Warraq.