Let’s consider some universal things. For example, everyone eats. When ancient people learned how to write, they recorded stories about every part of life including stories about people eating. Wouldn’t it be ridiculous to conclude that whomever was the first to make a written record of people eating must have invented eating? Is this rather absurd assumption any different than the presupposition made by those who claim the flood account originated with an author that pre-dates Genesis.
Other cultures may have written down flood stories that pre-date our oldest copies of Genesis, but this only indicates they were the first to write it down. After all, Genesis records a flood that happened when the earliest humans walked the earth, possibly before anyone had written language. Isn’t it interesting that cultures from the Mesopotamians to the Mayans have written stories of a great flood? It’s what you would expect to find the flood were an oral tradition handed down to all descendants no matter how far apart they eventually settled.
What are your thoughts?