The fundamental difficulty with Islam
Scholar Robert Reilly recently published a book, The Closing of the Muslim Mind, which points out a fundamental difficulty with Islam, namely that it rejected reason early in its history and instead embraced pure power as the first principle. (The primary importance of force certainly explains a lot about Hitler’s fondness for Islam.)
The rejection of reason also tells a lot about why Islamic societies are so deeply dysfunctional, because their religion rejects natural law (e.g. gravity, basic physics, etc. which Reilly calls "God’s customs” as viewed by Islam).