You definitely can't tell this book by its cover. Not only are the title and the cover's synopsis very misleading, but the picture you see on the front of the book has nothing to do with the book's subject matter.
I bought this book because it was recommended by The Economist in a book review when it was first released. It appeared to be an interesting discussion about how different religions have accepted or rejected images that were memorialized in print. In light of the Taliban's destruction of the Buddha statues, I was especially interested in this topic to enlighten me about how various cultures have viewed the representation of God, gods, people, animals, landscapes, etc. The Economist review and the book's cover led me to believe that this book would enlighten me in that regard. It didn't.
Be forewarned that this book is almost entirely about religious images and Christianity. There is some discussion in the beginning of the book about images of gods in ancient times (and what Plato and Aristotle thought about them), but most of the book is about the iconoclastic and iconophilic schools of Christian theology. (The discussion about iconoclasm in Judaism and Islam is limited to a few pages.) Hence, I would characterize this book under the heading philosophy, not art.
My only other comment pertains to the writing. Keep in mind that Besancon wrote this book in French, so you are reading a translation. I don't know if it's because of the writing in the original, the translation or the subject matter, but this is a very dry read. I will confess that I keep the book on the bedside table to provide soporific assistance. Calling itself an "Intellectual History" does not, to me, give a book license to be painfully boring.
While there are some interesting passages (such as the discussion about the Trinity in Christianity, which was helpful in explaining the concept of the Holy Spirit), I rate this book as two stars. I do this primarily because it was not what it purported to be. It would have been more aptly entitled, "The Depiction of the Divine in Christian Theology." And the cover picture should have been from a painting of a crucified Jesus. But then again, that probably wouldn't sell as many copies.