I am reading the book "Twenty Three Years: A Study Of The Prophetic Career Of Mohammad" by an Iranian writer called Ali Dashti, and its remarkable.
A little about his background:
In the book, 23 Years, Dashti chooses reason over blind faith:
"Belief can blunt human reason and common sense, even in learned scholars. What is needed is more impartial study."
Dashti strongly denied the miracles ascribed to Muhammad by the Islamic tradition and rejected the Muslim view that the Quran is the word of God himself. Instead, he favors thorough and skeptical examination of all orthodox belief systems. Dashti argues that the Quran contains nothing new in the sense of ideas not already expressed by others. All the moral precepts of the Quran are self-evident and generally acknowledged.
The stories in it are taken in identical or slightly modified forms from the lore of the Jews and the Christians, whose rabbis and monks Muhammad had met and consulted on his journeys to Syria, and from memories conserved by the descendants of the peoples of Ad and Thamud.
Muhammad reiterated principles which mankind had already conceived in earlier centuries and many places.
"Confucius, Buddha, Zoroaster, Socrates, Moses, and Jesus had said similar things. Many of the duties and rites of Islam are continuous practices which the pagan Arabs had adopted from the Jews."
http://en.wikipedia.org/wiki/Ali_DashtiDashti was born in 1896 and died after the revolution in 1982. He was arrested and incarcerated and beaten up by Khomeini's men and died soon after.
This book 23 Years was published anonymously around 1974 in Beirut.
He was a religious scholar who became a free thinker and he writes with a clarity that is rare even today. To have published this book even in the 1970's was to have taken a huge risk for his personal safety.