Wikipedia
Kaharingan is a folk religion professed by many Dayaks in Kalimantan, Indonesia. The word means life, and this belief system includes a concept of a supreme deity—although this may be the result of the need to conform to the idea of "One Supreme God" (Ketuhanan yang Maha Esa), which is the first principle of the Indonesian state ideology Pancasila. Hindu-Javanese influence can be seen in this religion, and the Indonesian government views it as a form of Hinduism because the Indonesian government recognizes only six official religions, and Kaharingan is not one of them. The main festival of Kaharingan is the Tiwah festival, which lasts for thirty days, and involves the sacrifice many animals like buffaloes, cows, pigs, and chickens as offerings to the Supreme God.
The supreme God in Kaharingan is called Ranying. In addition, it has ritual offerings called Yadnya, place of worship called Balai Basarah or Balai Kaharingan and holy book called Panaturan, Talatah Basarah (group of prayers) and Tawar (a guide to seek God's help by giving rice).