I have not read the book, but I am familiar with its thesis. Palmtree67, I appreciate your response, unfortunately, the fact that you refer to "Sharia Law" as if it is one form of law tells me that you have a surface knowledge of Islam.
Each version of Islam has a different form of Sharia law with different intepretations. Some for example say that the prophets statements regarding headcovering apply to today. Others say that those statements applied to only back then, because during that time period the umma was starving, their clothes were threadbare and women's bodies were visible through their clothing. Same verses; different interpretations.
That is why some Muslim women cover their heads, while others do not. Just like some Christians take blood, while others do not. But...people don't write books about moderate Muslims who practice moderate Sharia. :)