The Doubt Essential to Faith - TED Talk by Lesley Hazelton
You should know this not only because this Jewish woman writes a bio about Muhammad but because her overall point on why being without doubt is being a fundamentalist.
I also wonder if there is much rage in the Muslim world toward this Hazelton in the same way there was in the Christian world toward Reza Aslan and his book Zealot: The Life and Times of Jesus of Nazareth? Even though it is clear that what Hazelton expresses is that Muhammad had A LOT of doubt about his experience - which is counter to the dominate narrative about Muhammad and the faith of Islam on the whole, no?
Enjoy!