It could be just that almost all ancient civilizations were near water bodies that could flood. Any big flood would seem apocalyptic for the population size of the time.
The how/why of the flood is irrelevant. The fact that they all have them makes it not special/unique in the way that religion makes it out to be.
The how/why of the flood is irrelevant. The fact that they all have them makes it not special/unique in the way that religion makes it out to be.