I say quite deliberately that the Christian religion, as organized in its churches, has been and still is the principal enemy of moral progress in the world. (religion.blogs.cnn.com)
In no significant sense can we claim that there has been moral progress in the human race since the first pages of recorded history. (religion-online.org)
And so it is with the idea of progress, of which the idea of moral progress is part. (firstthings.com)