Most ancient civilisations were beside the sea or great rivers. To these people their local areas *were* the whole world. When you read the Old Testament for example you don't get any sense of a world outside a small area in the Middle East. If you cannot see why such cultures would have folk-tales about devastating floods in the past that killed nearly everybody "in the world" then you need to talk to the citizens of New Orleans. Imagine the stories that would be told a hundred years later about Hurricane Katrina in a pre-literacy S Louisiana culture with no flood-defences to speak of.
If you think that there is any evidence for a global flood then you need to talk to some geologists. They went looking for the evidence in the 18th Century, as geology became better understood. They found none, and no-one has found any since. Our modern understanding of geology is used by mineral and petroleum companies when searching for deposits. Those companies follow the money. If flood geology predicted anything in any useful way those companies would employ flood geologists, not conventional ones.
Amongst the things you need to explain if you want to sustain flood geology is angular unconformities. These make perfect sense with conventional geology, and none at all with flood geology.
I'll quote a crushing passage from it, for those who can't be bothered to follow the link...
"But eventually, by 1994 I was through with young-earth creationISM. Nothing that young-earth creationists had taught me about geology turned out to be true. I took a poll of my ICR graduate friends who have worked in the oil industry. I asked them one question.
"From your oil industry experience, did any fact that you were taught at ICR, which challenged current geological thinking, turn out in the long run to be true? ,"
That is a very simple question. One man, Steve Robertson, who worked for Shell grew real silent on the phone, sighed and softly said 'No!' A very close friend that I had hired at Arco, after hearing the question, exclaimed, "Wait a minute. There has to be one!" But he could not name one. I can not name one. No one else could either. One man I could not reach, to ask that question, had a crisis of faith about two years after coming into the oil industry. I do not know what his spiritual state is now but he was in bad shape the last time I talked to him. " "
First you're ignoring the evidence I presented, second the the Hebrew and Greek word used in the OLD & NEW testeament refer to GLOBAL flood, fissures all over the globe as well as over 270 accounts of this event worldwide...So I have my reasons and evidence to believe, but "angular conformities" as far as I understand, make no sense in this case when the flood lasted less than a year and much of the flood came up from beneath the surface anyway, not neccessarily rain.