Robert Royal, The God That Did Not Fail: How Religion Built and Sustains the West (Encounter Books, 2010), 336 pages, US$25.95.  Robert Royal’s accessible book The God That Did Not Fail is a take on The God That Failed (1949), a well-known collection of essays in which six famous men, including Arthur Koestler, tell of how they changed their minds about Marxism, one of the gods that failed during the twentieth century, the others being the gods we made of Darwinism, Nietzscheism and Freudianism. Royal’s book is more than a take, though. It also complements the intellectual character of the…