Leaving Islam is divided into four parts, with a preface and five
appendices.
Part 1: Theory and practice of apostasy in Islam The first part of the book presents an overview of the
theological-
juridical underpinnings of
apostasy in Islam based upon the
Qur’an, the
hadiths and written opinions from classical schools of
Islamic jurisprudence, as well as contemporary written pronouncements of Islamic jurists. The next section presents the history of the application of Islamic jurisprudence on apostates, documenting notable cases from the early centuries of Islam, such as those of freethinkers
Ibn al-Rawandi and
Rhazes (865–925), or skeptical poets such as
Omar Khayyam (1048–1131) and
Hafiz (1320–89), or Sufi (mystic) practitioners
Mansur Al-Hallaj (executed in 922),
As-Suhrawardi (executed in 1191), and the skeptic
al-Ma'arri (973–1057).
Part 2: Testimonies submitted to the ISIS website Part 2 consists of numerous case studies, covering modern-day apostasies, and conversions-out-of-Islam trends throughout the world. These were submitted to the website of the
Institute for the Secularisation of Islamic Society (ISIS), co-founded by Ibn Warraq.
Part 3: Testimonies of born Muslims: murtadd fitri The third part contains testimonies of Muslim-raised apostates, including the ex-Muslim
Ali Sina. According to Sina, it is no longer sufficient to simply not believe anymore, but "it is our duty to expose Islam, to write about
Muhammad's depraved lifestyle, about his shameful acts and his foolish claims." Many of the authors are from Iran, Pakistan and Bangladesh, where a strict version of Islam dominates society, even though the
lingua franca isn't Arabic, and these authors only discovered the real meaning of the texts after reading translations of the Quran, hadith and other early Islamic writings when they moved to the West.
Part 4: Testimonies of Western converts: murtadd milli The last part is about people born in the West who were not raised as Muslims, but
converted to Islam in later life, and then deconverted out of Islam again.
Appendices The appendix "Islam on Trial: The Textual Evidence" cites, amongst other scriptural sources,
Sahih Bukhari, Volume 9, Book 84, Number 57: "Whoever changes his religion, kill him." == Author's rationale ==