[Antoninus]

For what it's worth, that book How the Irish Saved Civilization was absolutely awful, written by a guy who had antipathy toward his subject and toward Western Civilization in general. Here's a review:

Book Review: How the Irish Saved Civilization

[ChessExpert]

Thanks for the warning. From your link:

“A good antidote to this book is How the Catholic Church Built Western Civilization by Tom Woods.”

I read it and can recommend it. Also:

What’s So Great about Christianity, by Dinesh D’Souza
https://www.amazon.com/Whats-So-Great-about-Christianity/dp/1414326017

By the way, I always like reading Robert Spencer.