He is regarded as the most famous atheist in the world but last night Professor Richard Dawkins admitted he could not be sure that God does not exist. He told the Archbishop of Canterbury, Dr Rowan Williams, that he preferred to call himself an agnostic rather than an atheist. The two men were taking part in a public “dialogue” at Oxford University at the end of a week which has seen bitter debate about the role of religion in public life in Britain. Last week Baroness Warsi, the Tory party chairman, warned of a tide of “militant secularism” challenging the...