Hinduism is the major religion with about 80% of the population adhering to it. About 11% of the population follows Islam and 8% follow Christianity. Evidence of prehistoric religion in South India comes from scattered Mesolithic rock paintings depicting dances and rituals in Stone Age sites such as the Kupgal petroglyphs of eastern Karnataka. Hinduism, often regarded as the oldest religion in the world, traces its roots to prehistoric times in India. The main spiritual traditions of South India include both Shaivite and Vaishnavite branches of Hinduism, although Buddhist and Jain philosophies had been influential several centuries earlier.
Ayyavazhi is spread significantly across the southern parts of South India. Islam was introduced to South India in the early 7th century by Arab traders in Malabar Coast of Kerala and spread during the rule of Deccan Sultanates from 17th to 18th century and the Muslims in Kerala of Arab descent are called Jonaka Mappila. Christianity was introduced to South India by Thomas the Apostle, who visited Muziris in Kerala in 52 CE and baptised Kerala's Jewish settlements.Kerala is also home to one of the oldest Jewish communities in the world who are supposed to have arrived in the Malabar coast during the reign of King Solomon