Abstract: Religion as a system of beliefs usually involving the worship of supernatural forces or beings continues to have major influence upon the human society. The paper is an outcome of intensive ethnographic fieldwork to explain the traditional religion of a tribe in North-East India called Tangkhul Naga who had traditional religion with relative isolation which according to the definition given by E.B. Tylor (1929) would have been polytheism but during the reign of British in India, Christianity swept over the entire region and this tribal community has since then embraced Christianity.