modernity tends to change culture (and especially homogenization that the interwebs promotes), and india is modernizing rapidly especially cities. culture can change very rapidly.
that being said, hanuman (rama's monkey companion) is a important diety in hinduism, and has been worshipped for many thousands of years in india and other parts of southeast asia.
https://en.wikipedia.org/wiki/Hanuman#Historical_development
The rig veda is probably what most people agree is one of the foundational texts of hinduism, but it dates to about 1500 BC.
However, the vedas probably absorbed a lot of earlier cultural tradition from the indus valley civilization, especially worship of Shiva-like deities. How much is however, debated.
just like mesopotamia, there was a lot of syncretism.