There were pre-existing folks in India, going back 40,000 years (the folks who walked around the Indian Ocean from Africa to Australia). The current Hinduism is a mixed bag of high and low. The high Hinduism comes from Central Asia, the E branch of Indo-European folks, from 6,000 years ago. The low Hinduism in the village is the evolved part of the aboriginal culture. The Aryan part is patriarchal, and the Dravidian part is matriarchal. The S Indian village has many local minor goddesses. This crystalized in Bengal into the worship of Durga/Kali.