Several authors answer the New Statesman‘s question. Here are some excerpts.
Alain de Botton:
For centuries in the west, there was a figure in society who fulfilled a function that is likely to sound very odd to secular ears. The priest didn’t fulfil any material need; he was there to take care of that part of you called, rather unusually, “the soul”, by which we would understand the seat of our emotions and of our deep self.Where have our soul-related needs gone? What are we doing with the material we used to go to a priest for? The deep self has naturally not given up its complexities and vulnerabilities simply because some scientific inaccuracies have been found in the tales of the five loaves and two fishes.
The most sophisticated response we have yet come up with is psychotherapy. It is to psychotherapists that we bring the same kind of problems as we would previously have directed at a priest: emotional confusion, loss of meaning, temptations of one kind or another and anxiety about mortality.