Your most recent book, John Stuart Mill: A Secular Life, is in OUP’s ‘Spiritual Lives’ series and is essentially a religious biography of Mill. Mill decided that strictly in terms of proof the right answer to that question of God’s existence is that it is ‘a very probable hypothesis’.
The relationship between anthropologists and Christian identity and belief is a riddle. I first became interested in it by studying the intellectual reasons for the loss of faith given by figures in the nineteenth and twentieth centuries. There are an obvious set of such intellectual triggers.