Possible Clues:

• It's much followed in North Africa
• How I shut the door on the Prophet
• Belief of 1.1 billion
• Koran studier's belief
• Faith of five million Americans
• Powerful Mideast force
• How I close the door on anything so prophetic
• A monotheistic religion based on the teachings of the prophet Mohammed
• Malcolm X adopted it
• Religion or I close the door to it