- A History of God: The 4,000-Quest of Judaism, Christianity and Islam (1994)
- Visions of God: Four Medieval Mystics and Their Writings (1995)
- In the Beginning: A New Interpretation of Genesis (1997)
- The Battle for God (2000)
- Islam: A Short History (2000)
- The Spiral Staircase: My Climb Out of Darkness (2004)
- The Great Transformation: The Beginning of Our Religious Traditions (2007)
- Muhammad: A Prophet of Our Time (2007)
- Twelve Steps to a Compassionate Life (2011)
Audio Program
- The Future of God (1996)