The Adivasis (Tribal/Indigenous people) play an important role in maintaining the “natural balance” (Devi 12). Their customs, rituals, and festivals are interconnected with the implicit conservation of nature and the environment. Their orientation towards the environment is shaped by their religious beliefs and customs (Xaxa 101). The Adivasi community such as Oraon, Munda, and Santhal has their own religion, called Sarna Dharam/ Adi-dharam. Sarnaism refers to their belief in the philosophy of Sarna religion. It revolves around nature; provides an alternative way of life that is capable of conserving nature and human life from the ensuing threat of anthropogenic disaster. It extends a way of life based on a continuum of nature, egalitarian principles, ancestors, and humans. For example, the rituals Sarhul and Karam festival center around Saal (Shoea Robusta) and Karam tree (Nauclea Parfolia) and provide us an opportunity to learn about the significance of natural organisms. Therefore, the present study attempts to examine the principles of Sarna religion and its role in the sustainability of nature. Furthermore, the study also explores how their religious performances (rituals and festivals) help them to conserve nature.