Much of the world today is convulsed in an epic struggle between the Christian West and Islam. Scholars seeking to understand the issues look back in history to unearth the roots of this conflict. Of great value in this effort are the writings of an eyewitness, a devoted Christian who served as chief financial officer of the Umayyad Empire and wrote at the time Islam was developing. John of Damascus (675-750) authored two major works, the Heresy of the Ishmaelites and the Disputation between a Christian and a Saracen, to provide an apologetic response to Islam from a Christian perspective....