Informed Christians have learned in our day that Islâm is not a primitive desert religion spread by the sword, for which faith is reduced to fatalism and women have no souls. Yet Christian historians of religion who avoid such gross errors still tend to present Islâm as at best an imperfect and parochial version of Christian truth, lacking any distinctive genius truly worthy of its independent dignity among the world religions. But until modern times, when the Christianity (and Judaism) of Europeans has been radically transformed along with their secular life, Christianity must long have struck an observer from Mars as, compared to Islâm, the relatively localized faith of largely backward lands. Islâm was the vehicle of a complex and sophisticated sense of social order in a varied and highly creative civilization which was expanding continuously until its field of action encompassed half mankind; it was the only one of the major historical religions which had successfully displaced in large areas other major faiths such as Christianity, Hinduism, and Buddhism. The Martian observing human history in the later Middle Ages might find it easier to understand why Muslims have looked on Christianity as merely an abortive form of Islâm, as for instance in the approach of those Şûfîs, Muslim mystics, who see the perfection of Islâm in its uniting at once the dispensation of Law, which reflects the Majesty of God, and the dispensation of Grace, which reflects his Beauty, whereas Judaism and Christianity are limited to only the one or the other. This Muslim conception is as inadequate, however, as its Christian counterpart. Probably any widespread religious system will find a place for all major types of religious insight and practice and is in its own way complete. Yet, as each system has matured, it has revealed a characteristic persistent pattern of norms in the interrelation and subordination to one another of all the elements embodied in it. If Christians are to perceive the genius of Islâm, it must perhaps be through the comparison of such persistent patterns.