It is astonishing that scholars of religion refer so little to the Manichaean faith, which in its day -- roughly from the third century AD through the fourteenth century -- was a fully fledged world religion, which interacted with Christianity, Buddhism, Islam, Zoroastrianism and Judaism. At various times, its adherents could be found across the whole of Eurasia, from France to China. It also created a substantial body of scriptures and commentaries, most of which are now lost. Manichaeanism (Manichaeism) is, I believe, the only example of a world religion that has arisen and then vanished entirely, seemingly without trace....