I know some (Christians) who have enjoyed reading this book because it articulates a scathing criticism of the Islamic faith. The book also criticizes Christianity, but in milder tones that can be glossed over in most minds of Christians. The author criticizes moderate and liberal Christians for providing cover for religious extremist. In response to this I conjecture that removal of the moderate option could result in the unintended consequence in increasing the number of religious extremest. The more moderate religious groups can provide a refuge for the extremest who grow weary of their positions. I elaborate more on my beliefs in my review
of Dawkin's The God Delusion.