Pre-Islamic Turkic mythology was dominated by Tengrism and shamanism. The chief deity was Tengri, a sky god, worshipped by the upper classes of early Turkic society until Manichaeism was introduced as the official religion of the Uyghur Empire in 763. The wolf symbolizes honour and is also considered the mother of most Turkic peoples. Asena (Ashina Tuwu) is the wolf mother of Tumen Il-Qağan, the first Khan of the Göktürks. The horse and predatory birds, such as the eagle or falcon, are also main figures of Turkic mythology.
Tengri Bögü Khan made the now extinct Manichaeism the state religion of Uyghur Khaganate in 763 and it was also popular in Karluks. It was gradually replaced by the Mahayana Buddhism. Tibetan Buddhism was the main religion after Manichaeism. 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 and Altai of Russia are the only remaining Buddhist Turkic peoples.
The Krymchaks of Eastern Europe (Especially Crimea) are Jewish, and there are Turks of Jewish backgrounds who live in major cities such as Istanbul, Ankara and Baku. The Khazars widely practiced Judaism before their conversion to Islam.
Even though many Turkic peoples became Muslims under the influence of Sufis, often of Shī‘ah persuasion, 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.
The major Christian-Turkic peoples are the Chuvash of Chuvashia and the Gagauz (Gökoğuz) of Moldova. 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.