You know what I know because I gave you the link.Really, you found the bones of Mr Rainbow?
Here you are badmouthing a divine being who's been around maybe twice as long as Yahweh, maybe 15 times as long. Your choice of god is a relative upstart, a Yahweh-come-lately, who seems more credible to you because his followers used writing.Maybe Rainbow said something like in the past people's came from Africa and crossed into Australasia when the seas were lower and boat building was well developed. And maybe said serpent can give the whole story of the various tribes of peoples who
spread out over the continent. And then of course, the coming of new tribes of white people and the end of the aborigines for many centuries. THEN I will take note of the Rainbow Serpent, because he/she has authority like the bible.
But all claims of magic, prophecy, the supernatural, are off-the-scale improbable ─ not even one authenticated demonstration anywhere, not even one coherent hypothesis about how magic is done or what 'supernatural' can mean other than 'imaginary' ─ and all gods are ideas, concepts, not real beings, as shown by the way every culture has one or more, of a great variety of kinds; and as far as I'm aware, they all lack a definition of 'god' such that we could tell whether any real being is a god or not.