'We are, whether we like it or not, religious animals, who started to worship gods early in our existence and who were creating religions as we painted the walls of our caves. We, the human race, are a God-seeking people.' As an acclaimed producer of religious documentaries for the BBC, then a leading biographer of religious figures including Desmond Tutu and Cicely Saunders, Shirley du Boulay has been at the centre of most of the major religious...