Humankind, the former museum director Neil MacGregor declares at one point in his new, 30-part radio series, might better be known as Homo religiosus rather than Homo sapiens. The faint air of reluctance with which so many of our national institutions often concede this point may be detected in the paragraph of the press release in which Radio 4’s controller, Gwyneth Williams, unveils Living With the Gods to potential listeners.