I'll be honest, there's not a whole lot I can add to this. And I'm afraid if I go into too much of a lengthy review on this, it might upset people. That is not at all my intent.
Full disclosure: I'm not very religious. Wasn't brought up with religious beliefs. I am not anti-religious by any stretch of the imagination. My feeling has always been this: If it works for you and you're not trying to force-feed your beliefs on others or using your beliefs as an excuse to cause harm to others, whether physically or mentally, groovy.
That being said, I really enjoyed god Is Not Great by Hitchens. I can imagine how this book would upset people. The title alone should be a pretty good indicator as if this should be something to add to your TBR pile, or dismiss it outright.
All I can tell you is that I enjoyed the book. And I also enjoyed listening to Hitchens read it. He reads very fast, and at times this can prove frustrating as you might end up missing a few things. A few times I found myself drifting, but for the most part I looked forward to it and regret that I finished it so quickly.
I cannot tell you if this is something you should read. That's always been my stance. Whether I'm reviewing fiction or not, something that's controversial or not. All I can tell you is my honest experience with the book. I really enjoyed it.