The synopsis of the book provided by the "Product Description" is fairly accurate. Therefore, I will only point out that (a) books on comparative history of ideas seem to be rather scarce; (b) it is difficult nowadays to get an objective, nuanced opinion on Islam, neither flattering nor biased against it (if I were to recommend a way to try and achieve this, I would suggest reading several good books on the matter, including this one among them).
So when I found this book I decide it to give it a chance, in despite of not finding previous comments on it. I was surprised that no one else had made a comment before to this masterful work, which, in my opinion, is impartial and enlightening. Perhaps, because of the author's style, the book is no very engaging, but it is not dry either. In any event I think that the professional historian and the educated layperson alike can savour it. So I add my review, my rate being between 5 (content) and 3 (pleasure, sometimes falling to 2, sometimes raising to 4). I highly recommend it.
Other interesting books dealing with the history of ideas that I would recommend would be the following: 1) "America's Constitution: A Biography" by Akhil Reed Amar; 2) "Citizens to Lords: A Social History of Western Political Thought from Antiquity to the Middle Ages" by Ellen Meiksins Wood; 3) "God Owes Us Nothing: A Brief Remark on Pascal's Religion and on the Spirit of Jansenism" by Leszek Kolakowski; 4) "The Passions and the Interests: Political Arguments for Capitalism before its Triumph", by Albert O. Hirschman; and 5) "The Proper Study of Mankind: An Anthology of Essays" by Isaiah Berlin.
For a better understanding of Islam, I would suggest reading the following works, it is worth it:
A) ASSESSMENTS OF ISLAM: 1) The best, impartial, wise: "Islam. History, present, future" by Hans Küng. 2) The political point of view of 1.3 billion Muslim people today: "Who Speaks For Islam?: What a Billion Muslims Really Think" by John L. Esposito and Dalia Mogahed; and 3) Harsh but well argued: "Muslims in the West: Redefining the Separation of Church & State" by Sami Awad Aldeeb Abu-Sahlieh;
B) WOMEN AND ISLAM. 4) A good reference book: "Women In Islam: An Anthology From The Qu'ran And Hadiths" by Nicholas Awde; and 5) Autobiography of a courageous woman: "Infidel" by Ayaan Hirsi Ali. She is a controversial thinker with a very interesting life.
C) HISTORY: 6) General: "The Venture of Islam", by Marshall G. S. Hodgson (nowadays a classic included in any bibliography on Islam); 7) Turks: "The Turks in World History" by Carter Vaughn Findley; 8) Political theory: "God's Rule : Government and Islam" by Patricia Crone; and 9) Jihad: Understanding Jihad" by David Cook.