Hinduism
HINDUISM. Hinduism is the religion followed by about 70 percent of the roughly seven hundred million people of India. Elsewhere, with the exception of the Indonesian island of Bali, Hindus represent only minority populations. The geographical boundaries of today's India are not, however, adequate to contour a full account of this religion. Over different periods in the last four or five millennia, Hinduism and its antecedents have predominated in the adjacent areas of Pakistan and Bangladesh and have been influential in such other regions as Afghanistan, Sri Lanka, Southeast Asia, and Indonesia. But in these areas Hindu influences have been superseded or overshadowed by the influences of other religions, principally Buddhism and Islam. This account will treat only of Hinduism as it has taken shape historically in the "greater India" of the Indian subcontinent.
Indus Valley Religion
There are good reasons to suspect that a largely unknown quantity, the religion of the peoples of the Indus Valley, is an important source for determining the roots of Hinduism.
The Indus Valley civilization arose from Neolithic and Chalcolithic village foundations at about the middle of the third millennium BCE as a late contemporary of Egyptian and Mesopotamian riverine civilizations. It engaged in trade with both, though mostly with Mesopotamia.