state religion of the Uyghur Khaganate in 763 and it was also popular among the Karluks. It was gradually replaced by the Mahayana Buddhism. It existed in the Buddhist Uyghur Gaochang up to the 12th century. Tibetan Buddhism, or Vajrayana was the main religion after Manichaeism. They worshipped Täŋri Täŋrisi Burxan, Quanšï Im Pusar and Maitri Burxan. Turkic Muslim conquest in the Indian subcontinent and west Xinjiang attributed with a rapid and almost total disappearance of it and other religions in North India and Central Asia. The Sari Uygurs "Yellow Yughurs" of Western China, as well as the Tuvans of Russia are the only remaining Buddhist Turkic peoples. Islam Most Turkic people today are Sunni Muslims, although a significant number in Turkey are Alevis. Alevi Turks, who were once primarily dwelling in eastern Anatolia, are today concentrated in major urban centers in western Turkey with the increased urbanism. Azeris are traditionally Shiite Muslims. Religious observance is less stricter in the Republic of Azerbaijan compared to Iranian Azerbaijan. Christianity The major Christian-Turkic peoples are the Chuvash of Chuvashia and the Gagauz (Gökoğuz) of Moldova, the vast majority of Chuvash and the Gagauz are Eastern Orthodox Christians. The traditional religion of the Chuvash of Russia, while containing many ancient Turkic concepts, also shares some elements with Zoroastrianism, Khazar Judaism, and Islam. The Chuvash converted to Eastern Orthodox Christianity for the most part in the second half of the 19th century. As a result, festivals and rites were made to coincide with Orthodox feasts, and Christian rites replaced their traditional counterparts. A minority of the Chuvash still profess their traditional faith. Between the 9th and 14th centuries, Church of the East was popular among Turks such as the Naimans. It even revived in Gaochang and expanded in Xinjiang in the Yuan dynasty period. It disappeared after its collapse. Kryashens are a sub-group of the Volga Tatars, and the vast majority are Orthodox Christians. Nağaybäk are an indigenous Turkic people in Russia, most Nağaybäk are Christian and were largely converted during the 18th century. Many Volga Tatars were Christianized by Ivan the Terrible during the 16th century, and continued to Christianized under subsequent Russian rulers and Orthodox clergy up to the mid-eighteenth century. Animism Today there are several groups that support a revival of the ancient traditions. Especially after the collapse of the Soviet Union, many in Central Asia converted or openly practice animistic