Mr. Bowler, correct yourself. Holy Quran was not written by anybody, it was a revealation from Almighty. Mohammed was illeterate and was not able to writ. Infact first Quran was made into a book much after his death. Till that time and infact today most of the muslims memorize whole Quran and this infact a miracle. As no other relegeous book can be memorized by peoples.
