...DR. SULTAN is "working on a book that — if it is published — it's going to turn the Islamic world upside down."

"I have reached the point that doesn't allow any U-turn. I have no choice. I am questioning every single teaching of our holy book."

The working title is, "The Escaped Prisoner: When God Is a Monster."

Dr. Sultan grew up in a large traditional Muslim family in Banias, Syria, a small city on the Mediterranean about a two-hour drive north of Beirut. Her father was a grain trader and a devout Muslim, and she followed the faith's strictures into adulthood.

But, she said, her life changed in 1979 when she was a medical student at the University of Aleppo, in northern Syria. At that time, the radical Muslim Brotherhood was using terrorism to try to undermine the government of President Hafez al-Assad. Gunmen of the Muslim Brotherhood burst into a classroom at the university and killed her professor as she watched, she said.

"They shot hundreds of bullets into him, shouting, 'God is great!' " she said. "At that point, I lost my trust in their god and began to question all our teachings. It was the turning point of my life, and it has led me to this present point. I had to leave. I had to look for another god."

She and her husband, who now goes by the Americanized name of David, laid plans to leave for the United States. Their visas finally came in 1989, and the Sultans and their two children (they have since had a third) settled in with friends in Cerritos, Calif., a prosperous bedroom community on the edge of Los Angeles County...