35 million people lived on Earth when the Bible says the story took place, yet none of them were affected by a supposed flood. Had there been a worldwide flood that reduced the world’s human population to a mere handful, civilizations and their cultural artifacts would have been destroyed.
Alas, the archaeological record shows that various civilizations around the world, and the human race, carried on in a steady fashion before, during, and after the flood supposedly took place with no evidence of such a disaster. Zoogeography shows the same for the animal kingdom. Nowhere in the history of modern man has life ever been bottle-nosed down to just 8 people, nor other animals to just 2 of a kind.

The most popular Mesopotamian flood story is the Babylonian Epic of Gilgamesh. It pre-dates the story of Noah and is likely the most influential source for the book of Genesis.
Exaggerated flood stories are so popular in the Mesopotamian because of several localized floods that actually did happen. Such as the rise of sea level after the ice age or the flooding of the Nile. Every year the Nile would flood causing destruction. The water would strip away the land, but when the water receded a layer of black mud was left making it the only soil in Egypt fertile enough to plant crops, thus allowing life to begin again. Ancients referred to it as the “Gift of the Nile.”