According to a 2009 Pew Research Center report, 93.1% of Turkmenistan's population is Muslim. Traditionally, the Turkmen of Turkmenistan, like their kin in Uzbekistan are Sunni Muslims. Shia Muslims, the other main branch of Islam, are not numerous in Turkmenistan, and the Shia religious practices of the Azerbaijani and Kurdish minorities are not politicized. The great majority of Turkmen readily identify themselves as Muslims and acknowledge Islam as an integral part of their cultural heritage, but some support a revival of the religion's status primarily as an element of national revival. History and structure Islam was introduced to Turkmenistan during the period of Islamic conquest by the second and third Rashidun Caliphs, Umar and Uthman. Integrated within the Turkmen tribal structure is the "holy" tribe called övlat. Ethnographers consider the övlat, of which six are active, as a revitalized form of the ancestor cult injected with Sufism. According to their genealogies, each tribe descends from the Prophet Muhammad through one of the Four Caliphs. Because of their belief in the sacred origin and spiritual powers of the övlat representatives, Turkmen accord these tribes a special, holy status. In the eighteenth and nineteenth centuries, the övlat tribes became dispersed in small, compact groups in Turkmenistan. They attended and conferred blessings on all important communal and life-cycle events, and also acted as mediators between clans and tribes. The institution of the övlat retains some authority today. Many of the Turkmen who are revered for their spiritual powers trace their lineage to an övlat, and it is not uncommon, especially in rural areas, for such individuals to be present at life-cycle and other communal celebrations. Islam in the Soviet Era In the Soviet era, all religious beliefs were attacked by the communist authorities as superstition and "vestiges of the past." Most religious schooling and religious observance were banned, and the vast majority of mosques were closed. An official Muslim Board of Central Asia with headquarters in Tashkent was established during World War II to supervise Islam in Central Asia. For the most part, the Muslim Board functioned as an instrument of propaganda whose activities did little to enhance the Muslim cause. Atheist indoctrination stifled religious development and contributed to the isolation of the Turkmen from the international Muslim community. Some religious customs, such as Muslim burial and male circumcision, continued to be practiced throughout the Soviet period, but most religious belief, knowledge, and