Atheists are funding a campaign that will see London buses bearing the poster "There is probably no god.  Now stop worrying and get on with your life".  Its the brainchild of Ariane Sherine and has been backed by Richard Dawkins.  We discuss the campaign, whether there really is no God and what it means for morality if there isn't.

To hear more discussions between Christians and non-Christians go to www.premier.org.uk/unbelievable.