You are using an idiosyncratic definition of "human". It may well be that Adam is not the ancestor of all humans, but all the people I mentioned were, as I said, Homo sapiens or, in common speech, humans. In fact, increasingly, I have seen "human" applied to all members of the genus Homo.
It's because I'm not Homo anything EXCEPT in the world's classification system. God classifies me as a Human, made higher than the Angels and destined to have dominion or rule over His Kingdom and every other living creature. Gen 1:28 Humans were made Billions of years BEFORE any other living creature Gen 2:4-7 making it impossible that Humans could have possibly evolved from the common ancestor of Apes as Godless Evolution falsely teaches.
I grant that if you use your definition (human=descendants of Adam =/= all H. sapiens) you can make sense of a global/local flood. But idiosyncratic definitions make for poor communication and understanding. Most people understand "human" as "H. sapiens". Further, there is no evidence that any group of H. sapiens are endowed with intelligence superior to that of other groups.
How many Cave men have you talked to? My point is that Humans became mixed with the prehistoric people who were already here when the Ark arrived. Today, there are 7 Billion Humans (descendants of Adam) alive on Planet Earth today. It could NOT be slow moving evolution since in the past 1% of time since Homos diverged from Chimps the descendants of Adam (Humans) have SUDDENLY taken mankind to the Moon and back and mindless evolution doesn't do ANYTHING sudden and has NO direction. Amen?
Well that would be local and it would not affect humans who were not descendants of Adam unless they lived in the same locality. It certainly would not affect those living on different continents, nor quite some distance removed from Turkey such as those in Central or South Asia, or China.
It affected every prehistoric person on this Earth some 11k years ago. They began slowly to inherit the superior intelligence of Adam which is like God's. Gen 3:22 Today, Humans, with a free choice to believe in Jesus or not, are getting close to the Judgment of what they really believe.
That I would agree with. That would be why the literary story of the flood depicts a global flood even though the historical flood was local.
It's confined to a single Lake in the mountains of Ararat, while religious zealots look for the 450 ft long covered barge on top of a mountain. Do they really think the Supreme Intelligence of Creation would put the Ark on a mountain instead of in the 1500 ft deep, 75 mile wide Lake? They probably had been following the Theology of ancient men. Amen?