In order to understand modern Holy War, it is essential to grasp the continued divisions and complexity of the modern Islamic world. One of the most important developments treated by Dr. John Rao is the growth of the "puritanical" Wahabi movement, which seeks to purge Islam from exaggerated Sufi and popular elements. Taken from: Crusading, the Crusader & the Christian Order - 2002 VonHildebrand Institute