In the late 1990s I wrote a history of the Knights Templar and, after a year or two immersed in the Crusades, was struck by how real was the fear of hell among Catholics at the time, and by what extreme measures they were prepared to take to save their souls. So central to their faith was this fear of damnation that present-day post-Vatican II Catholicism seemed in this respect like a different religion, writes Piers Paul Read in The Catholic Herald.