Surely you agreed that the sumerian culture disappeared at a certain point in time?
Ummm... No.
There is indeed geological evidence for a substantial flood in the mesopotamian area at least in the vicinity of the time that the sumerian culture existed.
Flooding was a part of life for people of the Tigris-Euphrates flood plain. There was not one flood that wiped out a culture.
What date does archaelogy give for the disappearance of the sumerian culture?
Unlike religion, archaeology does not give dates for things that never happened.
Soil salinity and influx of semitic people played a role in the decline of the Sumerians, but it didn't "disappear". It faded away.
You really should stay away from fundie sites and do some actual research.
Edited by Theodoric, : subtitle added
Facts don't lie or have an agenda. Facts are just facts
"God did it" is not an argument. It is an excuse for intellectual laziness.