Islam

Sunni Muslims are the largest group in Islam, comprising the vast bulk (80-90%) of the world's 1.5 billion Muslims, hence the title Ahl as-Sunnah wa’l-Jamā‘ah (people of the tradition and union)

The Shi'a constitute 10–20% of Islam and are its second-largest branch.[9][12] They believe in the political and religious leadership of Imams from the progeny of Ali ibn Abi Talib, who according to most Shi'a are in a state of ismah, meaning infallibility

Sufism is a mystical-ascetic approach to Islam that seeks to find divine love and knowledge through direct personal experience of God. By focusing on the more spiritual aspects of religion, Sufis strive to obtain direct experience of God by making use of "intuitive and emotional faculties" that one must be trained to use.