The Sumerians themselves didn't regard themselves as native to Mesopotamia, they said they'd arrived by sea. So say they. The oldest writing (that can be read) was their invention, so with them, history begins.
I'll go with the facts on the ground, including the ones under the water.
True science is a friend of the Bible. True science NEVER contradicts the Bible.
If it seems contradictory, it means that more understanding is needed either understanding scientific fact better or understanding Biblical truth better or both.
But normally, it’s conventional science catching up with the truth of the Bible.