For many millions of Muslims there is one and only one true Koran that offers the word of Allah to the faithful. Few Muslims realize, however, that there are several Korans in circulation in the Islamic world, with textual variations whose significance, extent, and meaning have never been properly examined. The author of Virgins? What Virgins? and Why I Am Not a Muslim has here assembled important scholarly articles that address the history, linguistics, and religious implications of these significant variants in Islam's sacred book, which call into question the claim of its status as the divinely revealed and inerrant word of the Muslim god. This work includes valuable charts that list the many textual variants found in Korans available in the Islamic world, along with remarks on their significance.