Kit?b al-Milal wa al-Nihal (Arabic:? , The Book of Sects and Creeds), written by the Islamic scholar Muhammad al-Shahrastani (d. 1153 CE), is a non-polemical study of religious communities and philosophies that had existed up to his time, considered to be the first systematic study of religion. It was written around 1127-1128 and divides religions between sects, which have written doctrines, and creeds which do not.
A French translation of the book by Gimaret, Monnot and Jolivet was sponsored by UNESCO (Livre des religions et des sects. Leuven, Peeters: vol. I, 1986, Vol. II, 1993).