The religion of Hinduism has its roots in India. However, the great age of Hinduism makes it extremely difficult to precisely pinpoint when the religion started in India.
While the exact age of Hinduism is uncertain, there is some belief from experts that Hinduism may have been in existence all the way back to 10000 B.C. The earliest Hindu writings are believed to have been produced earlier than 6500 B.C. Throughout its lengthy existence, Hinduism has become one the top five most popular religions worldwide, with an estimated base of one billion members. Some of the main themes of Hinduism include ethics and rebirth, in addition to numerous other themes such as truth, prayer and penance.