Okay, let's set one excuse aside first. "Well, maybe there wasn't a global flood, but that doesn't mean that Noah's flood didn't happen, because it could have been a local flood that was really bad, and..."
Bull$#!+.
The Bible explicitly says the entire world flooded. Trying to somehow frame the event as anything less is to implicitly admit the Bible is lying, so the excuse Noah's Flood wasn't a worldwide event is no excuse at all.
That being said, did a worldwide flood happen approximately 4,000 years ago?
No.
There is absolutely no good evidence to suggest the entire world flooded, and much to suggest nothing of the sort happened.
For one thing, the Earth simply doesn't have enough water to flood by a long shot. It's not that difficult to calculate how much water would be necessary to accomplish what the Bible insists happened (the entire surface of the Earth was covered to at least twenty feet over the peak of the tallest mountain). All you need do is calculate the volume of a hollow sphere with the inner sphere being the diameter of the Earth at sea level, and the outer sphere being the diameter of the Earth plus the height of the tallest mountain. That'll tell you the volume of water necessary, and then all you need do is compare that to the volume of water already in the oceans (without counting the ocean water itself since all of that already sits below sea level). You'll discover the Earth's oceans only hold about a quarter what's necessary to flood the globe.
Beyond that, floods leave very distinct geological evidence behind, and there simply is no singular geological record of a flood having occurred. It's very conspicuous in its absence. The layers in which the geological records are laid down are consistent with a very slow, gradual deposition. The fossil record is consistent with the Theory of Evolution, and while it does record several mass-extinction events, it shows none of the kind Noah's Flood would have caused.
Then there's the problem of people. We've simply been around longer than that. The Egyptian plateau was settled, and a society up and running, by 6,000 BC at the latest. That means the Egyptians have actually had a functioning society for 2,000 years longer than the Bible says the Earth has even been around. Must have been a shocking day for the Egyptians out working the fields and building their early cities when the entire Earth popped into being under their feet. Makes you wonder what the Hell they lived on before it came along.
In any case, their culture has run uninterrupted ever since. Let me say that again: The Egyptian culture has been functioning nonstop for at least the past eight thousand years. If Noah's Flood happened four thousand years ago, shouldn't they have all drowned? Should we not see a period where the cities are suddenly abandoned, where graves went undug and monuments went unbuilt, where historians stopped recording their history? Should we not have seen their population decimated and then rebuilt from the ruins?
The trouble is, we don't. The Egyptians had a fully functioning empire going for nearly 700 years by the time Noah's Flood supposedly happened, complete with cities and temples and a good handful of large pyramids already built, and throughout the time the flood supposedly happened, they went right on building their cities and monuments, and worshiping their gods, and living their daily lives and recording their history without so much as once mentioning the coming of a flood. Not once.
The story of Noah's Flood is a cute story to tell children in Sunday school, but only that. In reality, it never happened.