Epic of Gilgamesh vs Noah's flood.
Abraham came from Sumer, maybe that is why Genesis is very similar to Sumerian myths. The Sumerians worldwide flood myth is the same, with modifications. According to the flood account in the Epic of Gilgamesh, Utnapishtim overheard the gods(they used to visit Earth) planning the flood, a god called EA catches him and tells him to build an Ark, and get as many people and animals as possible in the Ark. So Utnapishtim was tasked to build what seemed like an almost cube like Ark which held many people and many animals, who all survived. This was recorded before the bible.
Most certainly with Genesis and Sumerian accounts, very similar. But Chinese accounts have appeared, all round the world accounts are there, the Norse mythology etc. Why copy if it didn't happen?