I've read this previously in manuscript form - and even wrote a short blurb to go on the back. But it's nice nestling down with a copy of the published book.
It's not a quick read, because it's very dense with factual detail and argument. Cliteur doesn't allow you to breeze through chapters that contain a lot of optional asides, jokes, anecdotes, and so on. You actually have to focus on the paragraphs. That doesn't mean that the style is inaccessible or difficult - not at all, it's very readable - but this is a meaty book that asks for (and rewards) a certain amount of concentration.
Cliteur's aim is to describe and defend secularism, and particularly the freedom to criticise religion. He spends a considerable amount of the book examining religion's dark side and arguing that we must be free to expose this and challenge it. There's a lot in here, and I can imagine coming back to the book again and again as a resource.