The deepest roots of the Indian religious and philosophical synthesis go very deep indeed. One of the great popular cult figures of the Hindu pantheon today is Shiva, in whose worship many early fertility cults have been brought together. A seal from Mohenjo-Daro already shows a figure who looks like an early Shiva, and stones like the lingam found in modern temples, the phallic cult-object which is his emblem, have been found in the Harappan cities. There is some presumptive evidence therefore for speculating that the worship of Shiva may be the oldest surviving religious cult in the world. Though he has assimilated many important Aryan characteristics, he is pre-Aryan and survives in all his multifaceted power, still an object of veneration in the twenty-first century. Nor is Shiva the only possible survival from the remote past of Indus civilization. Other Harappan seals seem to suggest a religious world centred about a mother-goddess and a bull. The bull survives to this day, the Nandi of countless village shrines all over Hindu India (and newly vigorous in his modern incarnation as the electoral symbol of the Congress Party).
Vishnu, another focus of modern popular Hindu devotion, is much more an Aryan. Vishnu joined hundreds of local gods and goddesses still worshipped today to form the Hindu pantheon. Yet his cult is far from being either the only or the best evidence of the Aryan contribution to Hinduism. Whatever survived from the Harappan (or even pre-Harappan) past, the major philosophical and speculative traditions of Hinduism stem from Vedic religion. These are the Aryan legacy. To this day, Sanskrit is the language of religious learning; it transcends ethnic divisions, being used in the Dravidian-speaking south as much as in the north by the
These developments took a long time. The steps by which the original Vedic tradition began its transformation into classical Hinduism are obscure and complicated. At the centre of the early evolution had been the