The reason why nobody believes your theory is that the timelines for differnt floods simply will not match up, period.
They're many thousands of years apart, in some cases hundreds of thousands of years.
For example, the hypothesis in this article is that the channel between England and France was cut 200 million to 400 million years ago.
Unfortunately for you, the Grand Canyon is only 5 to 6 million years old.
I mean, if the Old Testament said that God sent a volcano to chastise mankind, would you be massaging volcano sites all over the world, trying to make their timelines line up?
True, the "alleged" timelines don't line up. But what if the timelines are wrong?
What is obvious is that evidence of huge Biblical style water catastophies, much larger than anything in recorded history, have occurred in many places of the world. This wasn't expected by old earth scientists. In fact, it took a long time for them to recognize it.
Now that they are recognizing the role of monumental water catastrophies, maybe they will come to the realization that they haven't adequately considered this water catastrophe in developing their timeline.
If you used proper dating methods instead of circular reasoning such as the INDEX fossil, it matches up just fine. With that in mind I have no compelling reason to believe in or buy your godless theories.