As far as the fact that some written traditions may be older than the time of Moses, I ask - so what? The events in question (the creation account and the Flood) happened at one point in history, no matter when the records were written down. The first report is not always the most accurate. For example, I seem to remember seeing in history books that when Harry Truman was re-elected, one newspaper (which he showed to the press) declared in large print "Dewey defeats Truman." Would future generations studying the 20th Century (should other records be lost) be correct in assuming that this is what happened, simply because it was written down first? Of course not. The editors of the publication in question likely had their own ideals and agenda (likely they were Dewey supporters). The same is true with those who wrote down the Babylonian Epic and other ancient myths - they had an agenda of values and ideals that are important to their society which they wanted to blend in to the somewhat mist-transmitted flood account which had been passed down orally among their people.