You are bang on target. Rupert Hughes book "Why I quit going to Church" and a apostate Pakistani Anwar Sheik's autobiography can be the starting point. Ram Swarup has written a book Islam through Hadis- Religious faith or fanaticism. This book was sought to be banned by the Deobandi school of Indian terrorists but the Supreme Court of India rejected it, advising Ram Swarup to remove certain portions like the one on Qibla direction was originally towards jeusalem could not be substantiated by many reference etc. So the Supreme court held that his published work was indisputable. Hence please use it as a reference. Censors with shaky knees on this board should not be afraid of any fatwa