Hindu Population in India, Hinduism is the largest religion in India, with approximately 79.8% of the population identifying as Hindu, according to the 2021 Census of India. This means that there are approximately 1.2 billion Hindus in India. Hinduism is a diverse religion that originated in the Indian subcontinent and is characterized by a belief in reincarnation, a caste system, and the worship of multiple deities. Hinduism is also the third largest religion in the world, after Christianity and Islam. It is an ancient religion with a rich cultural and spiritual tradition, and it continues to play a significant role in the lives of many people in India and around the world.