The book is rather bias against Islam (although not as extreme as some). Whatever the two brothers claim, they do not seem to have a good understanding of Islam. They lack education regarding key aspects of Islam. Their argument that jihad is physical and does not have a spiritual dimension is wrong; the fact of the matter is that Jihad has both dimensions with the spiritual dimension being the greater as the Prophet Muhammad himself said in a Hadith. This is just one example from the many errors in the book.If you want to learn about Islam, find another book written by someone who has a good grounding in Islamic education and understands the Islamic tradition in an authentic manner. Murata & Chittick's book "The Vision of Islam", for example, is much better. This one is not an honest account I'm sorry to say.