That is equivalent to what you are saying. Even if we assume that the Genesis creation story is so impossible that it could never have occurred, this doesn't prove that global floods are impossible.
The global flood has never happened as described by Genesis, not in human history, because there are no geological evidences and archaeological evidences.
The global flood, according to Genesis, is set around some point in the 2nd half of the 3rd millennium BCE, my calculations of all the years and generations, backward from the fall of Jerusalem in 587 BCE, put it at around 2340 BCE.
This date put it around the same time of Teti (2345 - 2333 BCE), first king of the 6th dynasty, Old Kingdom Egypt.
If Noah's Flood had killed everyone as Genesis claimed, then this dynasty should have ended abruptly.
It didn't happen, because Teti's sons succeeded him, Userkare and Pepin I. Had there been a flood that wiped out Egypt, Teti and Pepin would not have been able to continue the royal customs of having their pyramids built in Sakkara, because there would have been not enough manpower.
Second, Genesis 10 clearly stated that Egypt didn't exist before the flood. Supposedly Egypt was the son of Ham and grandson of Noah. Clearly, that's rubbish, demonstrating the author(s) of Genesis to be terribly inaccurate, because 3rd dynasty began the pyramid-building programmes, early 27th century BCE, and the most famous pyramids in Giza were built by the 4th dynasty, centuries before Teti.
Egypt have always had floods, annually, some more devastating then others, but none of them indicated a global one.
And it is the similar case in Mesopotamia. They have floods annually, which help bring fertile soil from the north, but sometimes they have devastating river floods, but none showed sign of global one.
Had there been a global flood during the 3rd millennium BCE, it would have ended civilisation in Sumer. But there are no geological and archaeological evidences to support it.
Regional floods are devastating enough, but none of them occurred at the global scale, and it certainly didn't occur during the Bronze Age.
And there were no global flood in the Neolithic period. Again, there are lacking of evidences.
All you are doing is projecting and all tell me full of conjectures, that it could happen. I am quite confident that no such flood occurred in the Neolithic period and Bronze Age.
Lastly, there have been no evidences supporting the building of the Ark. There have always been a supposed sightings, but each time, these stupid creationists have been debunked. Dishonesty is the common practice of creationists.
If you can present me with evidences, then I would believe you. Evidences that show the flood occurred everywhere at exactly at the same time. Until then, all you have done is make one baseless conjecture after another.