Robert Reilly- weak wiki sauce, but relevant to WW events.

Reilly in 2010 published The Closing of the Muslim Mind,[4] published by the Intercollegiate Studies Institute. In the book, he draws a connection between the decline of the "rational" theological school of Mu'tazila in favour of the rise of Ash'arism, which would become the mainstream Sunni theology, in the 10th century. In this the author sees an act of "intellectual suicide", the nucleus of the end of the Islamic Golden Age and the decline of Islamic civilization into a "dysfunctional culture based on a deformed theology" locked in determinism, occasionalism and ultimately fatalism.

In his review of the book, Frank Griffith describes it as "war literature", and "a Catholic refutation of Ash'arite Muslim theology", complaining that Reilly constructs an undue equation between Ash'arism and contemporary Jihadism, while most Jihadists in fact follow Salafism and are hostile towards Ash'arism.[5]