Right idea, backward causality. We have *written* copies of the Mesopotamian version that are older than the entire Israelite culture.
Except I think the origin of the flood story is even older than that.
Why? Lots of places have floods and frequently.
Because small floods don't make legends and if there was a global sized flood in human history then that is what is going to be ingrained into human psyche that will trump any local flood.
If there was a local flood the Sumariens experienced some 6,000 years ago it would pale into insignificance to the global sized flood their ancestors would have experienced and be already passing the story down. Why would cultures then want to use a local flood as the basis when they all already had a global flood within their history to draw upon.
The Scablands of the (US) Pacific Northwest (all in Washington, I think) were formed by a series of floods from an identified source (a glacial lake) in Montana. They are not part of any other floods elsewhere in North America.
The glacial melt that caused the Scablands as far as I understanding comes from the same event as the glacials melts in the rest of the northen hemisphere at the end of the last iceage.
Nevertheless these big floods in the Northern hemisphere were etched into cultures and the story of them passed down. Which means that there were flood stories well before the local Mesopotamian one. The Sumerians already had their flood story well before any local flood 6,000 years ago.
It did not. There are many, non-coincident glacial outflow floods in NA and Europe most of which have identified dates and sources.
We know of massive floods from the ice melts though in that area around the NH around the same time at the end of the last iceage.
These floods occurred thousands of years before writing. We have no direct way to track back the inspiration of early writings about floods.
But they happened when humans were around that this event was etched into their psyche. This was passed down orally and this is how it became encultured as people developed.
The Sumerian flood story is from an older story passed down. The same with most cultures flood satories. Having such a major global event in human history so early would mean that these cultures did not need a local flood later to create their flood story. It was already there.
Easter Island was settled about 1000 years ago, long *after* the time of Jesus.
Yes so whoever were their ancestors it was them who exprienced the flood and passed down their story which they took with them to wherever they settled.
Glacial outflow floods occurred during the last retreat of the ice sheets, so there was definitely climate change, but there were also inflows of new H. sapiens populations into those areas at the same time. (More people + climate change = extinction event)
These floods during the end of the last iceage for whoever was around being such an extinction event would create stories about this forever etched in their psyche. Then their culture is overlayed onto this real event giving the different versions of the flood story.
The people who study myths and legends don't agree with you about there being "one source" for such stories.
Well all I know is that if there was a global sized extinction flood event in our distant past that people experienced, which most of the prehistorical world knew of. Then a legendary flood myth would come from this.
So any local flood that happened later cultures already had a flood myth to go by. So later localised flood would have only built upon this. I am sure people some 6,000 years ago with pretty elaborate thinking and belief would know the difference between a local flood that their trading nations did not experience and a legendary globalised flood that wiped out everything.
This divine communication seems a bit broken if it couldn't even transmit the true nature of the same god to all peoples who received it. Your post makes too many grandiose claims and collapses under their weight.
If you consider that before God revealed Himself as Yahweh humans did not know of the one true God. They were making sacrifices to gods before God has instituted His sacrifice that became so significant for Christianity. So humans knew about God but worshipped false gods and idols. They knew about sacrificing to gods as a natural inclination.
Then God came along and revealed to Abraham the true source of all this worshipping and sacrificing. God used what was naturally happening to reveal Himself to us. Without that pre existing understanding this would not have made sense to Abraham.
It makes sense to me that a similar revelation happened with Noahs flood. A real flood event happened in our distant past before humans could write and this was orally developed over time. Another piece of evidence is the glyphs and some of these talk about a great flood.
But as cultures evolved more sophisticated beliefs they developed the flood story. The important thing is that they all seen that this flood was from the gods as punishment. Once again the ancient stories passed down speak of this.
The God revealed to Moses who is suppose to have written the Genesis the true story of the flood. Just like God comes along to Abraham and reveals the true story of all these gods and sacrifices being made. He reveals to Moses the true source and reason for all these flood stories everyone was already believing but attributing this to the false gods.
PS if it sounds like an hypothesis (if you could call it that) its because it is. I am not saying that this is all correct. I am thinking out loud in trying to reconcile everything.