Chapter eleven, Islam – Judaism’s Cousin, begins with the establishment of Islam, ostensibly as a correction of Judaism that was perceived as wayward by Muhammad. The spread of Islamic influence, though not necessarily the faith itself, through warfare is described. The strong Muslim belief that all aspects of Islam came from God is noted; and the text frequently refers to the Qur’an in its descriptions. Islam believes the purpose of humankind is to worship God. The Muslim legal code of sharia is described.