This is really an amazing book. Many in the west, looking upon Islamic fundamentalism with horror, wonder where the liberal and moderate Muslims are, and why they don't speak up. An-Na'im is just such a voice. A dedicated Muslim writing mainly to Muslims, he makes the case persuasively that, contrary to the opinion of many Muslims and non-Muslims, not only is Islam compatible with secularism, a correct understanding of Islam demands secularism. For me as a westerner, the most intriguing part of the book was the section where the author examines three states with significant Muslim populations and their struggles with secularism: India, Turkey, and Indonesia. The opposition to secularism is most apparent in Indonesia, where secularism is considered inherently western, and therefore inherently inappropriate for a predominantly Muslim state.
If I had one small complaint about this book, it is that despite its subtitle Shari'a is hardly touched on until the last chapter. True, it is discussed there at some length, but I felt hungry for more.