Corrction: the Sumerian creation story does not involve turtles, and, to some, has distinct parallels with Genesis.
http://www.geocities.com/garyweb65/creation1.html
Well then check out the ancient babylonian myths.... :^)
BTW lots of creation myths from many cultures and eras have distinct parallels with Genesis.
I'm told by the highest authorities that turtles are unexplained by evolution. A creation story that explains the existence of turtles is therefor superior to evolution.