Reilly in 2010 published The Closing of the Muslim Mind,[7] 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 favor of the rise of Ash'arism, which would become the mainstream Sunni theology, in the 10th century. The author argues that the widespread acceptance of the Ash'ari school in the Islamic world resulted in "intellectual suicide" that was primary reason for the end of the Islamic Golden Age and the decline of Islamic civilization, transforming Islamic society into a "dysfunctional culture based on a deformed theology" locked in determinism, occasionalism and ultimately fatalism. In his review of the book, Frank Griffel describes it as "war literature", and "a Catholic refutation of Ash'arite Muslim theology", lamenting that Reilly constructs an undue equation between Ash'arism and contemporary Jihadism, while most Jihadists in fact follow Salafism and its more restrictive "traditionalist" school of theology which is hostile towards Ash'arism.[8]
He has repeatedly condemned homosexuality and same-sex marriage, and wrote a book in 2014, Making Gay Okay: How Rationalizing Homosexual Behavior Is Changing Everything.[3]
He is director of the Westminster Institute, a conservative research organization set up in Virginia in 2009.[9][3][1] He is a former senior fellow at the American Foreign Policy Council.[10]
On December 9, 2020, USAGM Director Michael Pack appointed Reilly as the Director of VOA.[2][9][3] Reilly was removed as the VOA Director on January 21, 2021, shortly after President Joe Biden's inauguration.[4][11]
Publications
Justice and War In the Nuclear Age, "The Nature of Today's Conflict," University Press of America, 1983.
Peace In a Nuclear Age, "In Proportion to What? The Problem With the Pastoral," Catholic University Press, 1986.
Der Politische Krieg: Die Reale Gefahr, ("The Political War: The Real Danger"), Soviet Global Strategy, Ost-Institut, Switzerland, 1986.
The New Federalist Papers, "E Pluribus Unum," University Press of America, 1989.
The Fall of the Wall, editor, Publisher C.L.E.B Gallery, 1990.
We Hold These Truths, "The Truths They Held," Franciscan University Press, 1991.
The Catholic Imagination, “The Music of the Spheres,” St. Augustine Press 2003.
Surprised by Beauty: A Listener's Guide to the Recovery of Modern Music, Revised and Expanded Edition, Ignatius Press 2016.
The Roots of Islamist Ideology, CRCE Briefing Paper, London, 2006.