Abdulkadir Inan in the context of "Tengrism"

Tengrism (also known as Tengriism, Tengerism, or Tengrianism) is a belief system originating in the Eurasian steppes, based on shamanism and animism. It generally involves the titular sky god Tengri. According to some scholars, adherents of Tengrism view the purpose of life as to be in harmony with the universe.

It was the prevailing religion of the Göktürk, Hun, Xianbei, Bulgar, Xiongnu, Yeniseian and Mongolic peoples, as well as the state religion of several medieval states such as the First Turkic Khaganate, the Western Turkic Khaganate, the Eastern Turkic Khaganate, Old Great Bulgaria, the First Bulgarian Empire, Volga Bulgaria, Khazaria, and the Mongol Empire. In the Irk Bitig, a ninth century manuscript on divination, Tengri is mentioned as Türük Tängrisi (God of Turks). According to many academics, Tengrism was, and to some extent still is, a predominantly polytheistic religion based on the shamanistic concept of animism, and was first influenced by monotheism during the imperial period, especially by the 12th–13th centuries. Abdulkadir Inan argues that Yakut and Altai shamanism are not entirely equal to the ancient Turkic religion.