The Kirats, in the time of their ancestors, had no artificially constructed temples and recited the Mundhum orally. They considered natural caves, trees, and mountains as temples and did not worship idols. They regarded air, water, fire, earth, sky, rivers, large stones, and nature itself as gods and offered sacrifices of animals, birds, and blood. However, the Mundhum also describes that, with the development of human civilization, various gods and goddesses were established and worshipped to protect every living creature on Earth, including forests, humans, and animals. This system of worship continues to this day, including deities such as Yuma Sammang, Theba Sammang, Akwanama, Nahen Sammang, Tambhungna Sammang, Manggenna, Nahangma Manggenna, and Muden Sammang etc.

As time passed and with the advent of the modern era, their gurus began building physical, artificial temples and other infrastructures visible to everyone, such as Mujolung and Khejolung, along with statues of the great gurus. Since the time of Mahaguru Muhingum Ongsi Falgunanda Lingden, the oral Mundhum was recorded in writing to preserve it for future generations. He also conveyed religious messages to his followers, urging them to stop killing animals and birds in the name of gods and goddesses during worship. Instead, they were advised to worship all gods and goddesses by offering fruits, flowers, and lighting lamps.

Mahaguru Muhingum Ongsi Phalgunanda Lingden explained, according to the Samjik Mundhum, that the creator has not given us the right to torture or kill animals, birds, or any living creatures. The Mundhum states: “eksa khambek khemma, pokla lunglang khemma, tabu singlang khemma, chavat thungwa khemma fa-ang thokpu kubu, yongghan kussa, thupmen pewa, yasa khirey, leknga, hayonggna ha-ren nawa chait chogung-sing-ang waro,” which means: “I have created animals, birds, fishes, and many living beings to beautify the earth, rivers, oceans, and forests.” And again, the Mundhum says: “Taandi thokpu kubu, yongghan kussa, thupmen pewa, yasa khirey ha yorik mebon-nang tarang tangsang le meghoptusin-niya, eksa khambek, chavat thungwa o mehatun-xin-niya, chaghat chamvanle meyoruxin-niya pha-ang keba, mayu, muya, hamba ha-ren nawa chait chogung thangsing-aang waro,” meaning: “In the future, these creatures—animals, birds, and fishes—may become so numerous that the sky may not cover them, and the earth, rivers, and oceans may not be able to accommodate them, nor provide enough food. Therefore, to control the spread of these animals, birds, and fishes, I have created tigers, bears, eagles, otters, minks, snakes, and others. Also, to protect and save all these creatures, I have created humans as conscious beings.”