around 4000 years back. Among the Munda people and Oraons of Bihar, about 25% of the population are Christian. Among the Kharia people of Bihar (population about 130,000), about 60% are Christians. Tribal groups in the Himalayas following Bon religion were similarly affected by both Hinduism and Buddhism in the late 20th century. The small hunting-and-gathering groups in the union territory of the Andaman and Nicobar Islands have also been under severe pressure of cultural assimilation. Recognition According to the Indian legal system, all the native or indigenous religions of India fall broadly under Hinduism, since the constitution does not classify only Vedic religions as Hinduism as used in the colloquial norm. The term "Hindu" is derived from Persian meaning "Indo" (or Indian), hence the official word "Hinduism" broadly refers to all the native cultures of the Indian subcontinent. The 1955 Hindu Marriage Act "[defines] as Hindus anyone who is not a Christian, Muslim, or Jew". List of current folk religions Adivasi religion Ahom religion Bathouism Donyi-Polo Kirat Mundhum Sanamahism Saridharam Sarnaism Niamtre (Pnar tribe) See also Dravidian folk religion Folk Hinduism Indian religions Kalashism and Kafirism Bon References Indian religions Scheduled Tribes of India Asian shamanism