I have debated those who believe in a global flood ca. 4,350 years ago for many years now on the web.
I have yet to find any argument that they provide that goes beyond "the bible says so" that is not easily refuted.
I have been doing archaeology for over 40 years, and have examined the time period ca. 4,350 years ago in probably close to 100 different sites. I have been able to find mtDNA evidence of continuity from over 5,200 years ago to the present without the discontinuity which would be necessary if there had been a global flood ca. 4,350 years ago. I also see continuity of culture, technology, and sedimentation without the disruption that a global flood would have caused.
So, if my task is to argue that the flood did occur, I must fall back on "the bible says so" as that is the only thing that supports the idea of a global flood at that time period.
Religious belief does not constitute scientific evidence, nor does it convey scientific knowledge.
Belief gets in the way of learning--Robert A. Heinlein
How can I possibly put a new idea into your heads, if I do not first remove your delusions?--Robert A. Heinlein
It's not what we don't know that hurts, it's what we know that ain't so--Will Rogers
If I am entitled to something, someone else is obliged to pay--Jerry Pournelle
If a religion's teachings are true, then it should have nothing to fear from science...--dwise1
"Multiculturalism" does not include the American culture. That is what it is against.