Actually, the geological records we have today prove that there was no worldwide flood 5,000 years ago. The Flood's legend is told in most ancient civilizations, which makes archaeologists, scientists and geologists concede that a local flood could have occured around the Meditteranean, and you and I both know that any natural catastrophe back then would have been interpreted as Divine Retribution from an Angry God. Who knows? Maybe the people living around that area were real shitheads that deserved to be wiped out. So along come a big flood, kills them off and the survivors are all happy again thinking that God killed all the bad people.
Surprisingly, I even know of some Witnesses to (secretly) think that it was a local flood, and not an earthwide flood......but of course, they can't say that too loud, lest they get hauled into the back room for 'a little chat'....