Brahmajala Sutta (Theravada)
In the second part, the Buddha explains the major beliefs of ascetics in India. He begins by saying, ""Monks, there are other things which are very deep (profound), very hard to understand, very difficult to perceive, so holy and sacred, unreached by means of mind, so subtle, that they are only to be understood and experienced by the wise. These things were perceived clearly, seen clearly and were discarded by the Tathagata, and by this act based on the truth that people praise and revered Tathagatha. What are those things?""
Dravidian folk religion
Scholars regard Indian religions as a fusion or synthesis of various Indian cultures and traditions.
Among its roots are the historical Vedic religion of Iron Age India, itself already the product of "a composite of the indo-Aryan and Harappan cultures and civilizations", but also the Sramana or renouncer traditions of northeast India, and mesolithic and neolithic cultures of India, such as the religions of the Indus Valley Civilisation, Dravidian traditions, and the local traditions and tribal religions.