Excerpt:
A best-selling author questioning the origins of Islam in a new book has received death threats on the Twitter social networking website.
Robert Spencer, director of the website "Jihad Watch," questioned the source of Islam in a new book, "Did Muhammad Exist? An Inquiry into the Obscure Origins of Islam," published by ISI Books. Spencer is also the author of The Politically Incorrect Guide to Islam (and the Crusades), The Truth about Muhammad (both New York Times best-sellers) and is a columnist for FrontPage Magazine.
But upon publication of his latest book, which theorized that the founder and prophet of Islam, Muhammad, did not really exist, Spencer was threatened with a violent death.