The document discusses the origins and history of religion in India. It describes how the Aryans migrated to India around 1500-1000 BC from Central Asia, bringing their language and beliefs. They encountered the earlier Dravidian civilization centered around the Indus Valley. While some viewed this as an invasion that displaced the Dravidians, more recent research suggests it was a gradual interaction and merging of the two cultures that gave rise to Hinduism, one of the world's oldest religions still practiced today.