Great analysis of Dawkins, Hitchins et al a couple of days ago in the Guardian by John Gray. It's quite long, but worth a read. Here's a snippet:
The problem with the secular narrative is not that it assumes progress is inevitable (in many versions, it does not). It is the belief that the sort of advance that has been achieved in science can be reproduced in ethics and politics. In fact, while scientific knowledge increases cumulatively, nothing of the kind happens in society. Slavery was abolished in much of the world during the 19th century, but it returned on a vast scale in nazism and communism, and still exists today. Torture was prohibited in international conventions after the second world war, only to be adopted as an instrument of policy by the world's pre-eminent liberal regime at the beginning of the 21st century. Wealth has increased, but it has been repeatedly destroyed in wars and revolutions. People live longer and kill one another in larger numbers. Knowledge grows, but human beings remain much the same.
HT Jonny Baker