On Easter Sunday night, more Americans watched “The Ten Commandments” on ABC than any other show, even allowing for the fact that the audience was not as big as last year’s. What was most telling was how it creamed the religious fare shown on the Travel Channel and the Science Channel. The Travel Channel gave us “Greatest Mysteries: Holy Land,” a one-hour presentation that took the viewer on a rambling ride through hidden rooms and caves looking for the Holy Grail; a guest appearance by Heinrich Himmler, head of the Nazi SS, rounded out the first segment. The Shroud of...