What is Religion in ancient Tamilakam?

The Sangam period in Tamilakam was characterized by the coexistence of many religions: Shaivism, Vaishnavism and later adopted Buddhism and Jainism alongside the folk religion of the Tamil people. The monarchs of the time practiced religious tolerance and openly encouraged religious discussions and invited teachers of every sect to the public halls to preach their doctrines. Hinduism, Jainism, and Buddhism were the three major religions that prevailed in the Tamil region predating the Christian era, as early as the Sangam period.