I seriously love Sam Harris' book, 'Letter to a Christian nation.'
Sam Harris gets attacked mercilessly by some, not just religionists, but also by some on the Left (the Regressive Left, so called) who think you can't criticise anybody's anything because if you do you are a bigot or racist or whatever. Nonsense. My own politics are very left, but not regressive left. Harris's critique of religion is strident, but reasoned and fair. In debate he is deadly. He will cut through to the central point, and expose religionists' ambiguities and inconsistencies brilliantly. There is no one I enjoy more in debate than Harris.