In the second episode of this Radio 4 series the Atheist was A. C. Grayling and the arguments were somewhat more pointed. He and the Bishop visited Bacon College (an inner city academy) and Camp Quest. The ethos of the school, which is a Church of England academy, is naturally to achieve social cohesion and for the pupils not to question their differences too closely. A. C. tried to get some of the pupils to think more deeply about these differences.
Towards the end the Bishop insisted on the importance of Christianity recognising the human "capacity for evil", and there was no time to follow this up, but surely it simply begs the question by assuming the prior existence of good and bad out there in the world before we have applied our reasoning powers to decide what is good and what is bad.