For many centuries, the world of Islam was in the forefront of human achievement--the foremost military and economic power in the world, the leader in the arts and sciences of civilization. Christian Europe, a remote land beyond its northwestern frontier, was seen as an outer darkness of barbarism and unbelief from which there was nothing to learn or to fear. And then everything changed, as the previously despised West won victory after victory, first in the battlefield and the marketplace, then in almost every aspect of public and even private life.

In this intriguing volume, Bernard...