China - Fuxi & Nuwa, snake people who created humanity
Adam & Eve - the snake catalysed our release upon the world, and escape from the garden
Greece - Zeus was thought to be the source of life and would also shift into snake-form. Ophion (a snake) incubated the primordial egg from which all life was formed
Indigenous Australians (and Californians) - Snake Mother / Rainbow Serpent create everything
Egypt - the state of existence before creation was symbolized as Amduat, a many-coiled serpent from which Ra the Sun and all of creation arose
why snakes tho?
Also for example the snake in the garden of eden is playing a completely different role in the myth from the snakes in Australia. For example if the animal in Genesis that subverted Eve was a bird you wouldn't say oh look, the bird in Genesis is playing the same role as the snakes in Australia.
Having said all that sure, snakes do play a prominent role in the myth cycles of many cultures and it's interesting to speculate why. Snakes evoke a visceral reaction in us, which would be easy for people to interpret as an almost magical or supernatural effect.
The reality is that we were always meant to eat from the Tree of Knowledge, such that we may have an internal sense of right from wrong rather than being limited to "God said this is good/bad". At worst, the Serpent accelerated that inevitability before we were ready to accept the responsibilities such knowledge would entail (that readiness coming later, with Jesus providing the framework by which we can ready ourselves).