Overview

Hinduism, regarded as the world's oldest organized religion, originating over 3,000 years ago, has now grown to be the world's 3rd largest religion. Differing from most Western religions, Hinduism has no single founder, theological system, system of morality, or central religious organization. Encompassing about 13% of the world's population (837 million followers), Hinduism is the dominant religion in countries such as India, Nepal and Sri Lanka.

http://www.religioustolerance.org/hinduism.htm