I tend to agree with the first review on this site by "a reader" who wonders whose side Stephen Schwartz is on. I have read his articles in The Weekly Standard and elsewhere and expected a more Western view of Islam. The acknowledgement section at the end of the text reveals what some chapters implied, that Schwartz is himself a Sufi mystic from a Jewish background. That explains his portrayal of the Shi'ites and Sufis in the Balkans, Caucasus and central Asia in innocuous terms, and his soft treatment of the Iranian Islamist revolution.
That being said, his book is an excellent and detailed portrayal of the rise of the Sa'ud dynasty and its partner, the Wahhabi sect of Islam, which I would describe as a Bedouinized, harsh and austere view of religion. I dislike the terms radical and fundamentalist because they suggest a return to the roots or foundational principles of a movement. Judging rom Schwartz's account of the life and character of Muhammed, there is very little of his basic principles in Wahhabism, which is militant and domineering, practicing a kind of religious colonialism toward all other branches of Islam using oil wealth to export its philosophy through building mosques, complete with Wahhabist imams and schools of indoctrination nearly everywhere. These are the source of mujahadin, who are not the philosopher warriors of the past but brainwashed juveniles who have been turned into suicide bombers in madrassas. They have had their view of life, the normal hope and ambition of young people, stripped away and a vision of martyrdom, resting in the Garden of Allah with 72 dark-eyed virgins, inculcated in its place.
This book left me with unanswered questions about the Iranian version of Islam, which Schwartz says is very strict, but not imperialist like the Wahhabis, but its recent meddling in Iraq and attempting to foment a Shi'ite uprising makes me doubt that.
The book is a collection of Schwartz's past writings as a journalist, and so seems disjointed and erratic at times, but it is nevertheless a good history of the Sa'ud dynasty and its support for terror around the world. More Westerners need to look beyond the assurances from our governments and media that Wahhabism is merely a conservative form of Islam. It's not. It's an apostate doomsday cult with the same kind of aims as Communism and Nazism, to conquer and control the world. It's as hostile to other historic brands of Islam as it is toward Jews and Christians, and it must not be allowed to use our laws and tolerance of religious pluralism as cover for its subversive and deceitful activities.