Islam, Uyghurs were Tengriist , Manichaeans , Buddhists , or Nestorian Christians . Chagatai Khanate Main article: Chagatai Khanate The Chagatai Khanate was a Mongol khanate that initially inherited part of the Mongol Empire that comprised the lands controlled by Chagatai Khan (alternative spellings Chagata , Chugta , Chagta , Djagatai