In a serialized manifesto written from prison in Egypt, Sayyed Imam al-Sharif is blasting Osama bin Laden for deceiving the Taliban leader, Mullah Omar, and for insulting the Prophet Muhammad by comparing the September 11 attacks to the early raids of the Ansar warriors. The lapsed jihadist even calls for the formation of a special Islamic court to try Osama bin Laden and his old comrade Ayman al-Zawahri.

The disclosures from Mr. Sharif, also known as Dr. Fadl and Abd al-Qadir ibn Abd al-Aziz, have already opened a rift at the highest levels of Al Qaeda. The group's deputy, Ayman al-Zawahri, a former associate of the defecting theologian in Egypt, personally mocked him last month in a video, remarking that he was unaware Egyptian prisons had fax machines. Meanwhile, leading Western analysts are saying the defection of Mr. Sharif indicates the beginning of the end for Al Qaeda.

The author of "Inside Al Qaeda," Rohan Gunaratna said in an interview this week, "There is nothing more important than a former jihadist as important as Dr. Fadl criticizing the jihadist vanguard." Mr. Gunaratna, who acts at times as a consultant for American and Western intelligence, described the reformed theologian as "both an ideologue and operational leader, but he was primarily an ideologue."