We've known since at least 1872 that the Great Flood detailed in Genesis is a descendant of earlier flood myths from Mesopotamia.
MORE: http://www.newrepublic.com/article/116287/babylonian-tablet-describes-noahs-ark-pre-bible
See also...
Bryan Fischer Falsely Crows About Ancient Ark Text on Tablet Now on Display at the British Museum
http://www.patheos.com/blogs/friendlyatheist/2014/01/26/bryan-fischer-falsely-crows-about-ancient-ark-text-on-tablet-now-on-display-at-the-british-museum/
