I went to a Catholic high school. During my senior year, I took both an AP European History course, and a theology course on Church history. The AP European history textbook was a thick book with tiny print, but while most of the other students didn't bother to read it, I did, and I found out many things about the Crusades, the Inquisition, and the endless religious and nationalistic wars and massacres of European history. It was almost comical to contrast this with the view of history that was offered in the Church-sponsored book on Church history (which, of course, had large friendly print and lots of pictures, and which, I'm sure, more students read).