Of course, Indigenous people worshiped the various Gods and Goddesses. Aryans were migrants to India. Vedic beliefs were different. When the Aryans merged into the main Hindu stream, they brought in changes as well - Vishnu becoming one with Rama and Krishna and Rudra becoming one with Shiva. All this is known world over.
Who brought in the changes? The Dravidians (mentioned as Dasyus* in the Veda) or the Aryans, per force. Please
Regards
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"*Dasyu
Alternative Titles: dāsa, dasa-bhritaka
Dasyu, Sanskrit dāsa (“servant”), an aboriginal people in India who were encountered by the Indo-European-speaking peoples who entered northern India about 1500 bce. They were described by the Indo-Europeans as a dark-skinned, harsh-spoken people who worshipped the phallus. Some Western scholars who view the
lingam (a Hindu votary object) as a phallic symbol have conjectured that it originated with the
dasyu; others hold that this description of the
dasyu may have referred to their sexual practices. The
dasyu lived in fortified places from which they sent out armies. They may have been among the
Shudras, or labourers, who served the three higher classes—
Brahman (priests),
Kshatriya (warriors), and
Vaishya (merchants)—from whose ritual communion they were excluded.
dasyu | people "