So let's consider more about our genetic makeup of how God created us. It's truly like whirlwind said, two people of one race do not produce offspring of another race. That has not changed one iota since God's creation. How do we know that? Because of what God gave to Moses about one of mixed blood that was not to enter into the congregation to their tenth generation per the Old Covenant (Deut.23:2). Why to the 10th generation? Because that's how long God set that for the mixing to be purged out. That's why when today, someone of a mixed race continues to marry only in one side, either their mother or father, the features of the other family side will begin to recede. That does not reveal evidence for evolution, but the opposite of evolution, even the going back to God's original creation.
Archaeological evidence for the races exist easily going back to 3800 B.C. with the difference between the ancient Sumerian people and Sargon (a Semite) that traveled to live among the Sumerians, and then later Semites that came there afterwards. The time of God creating Adam per the Bible's chronology was 4004 B.C., so that's only 204 years difference with Sargon and the ancient Sumerians. That exists to show at least those two different races of people like the Sumerians and Semites existed all the way back to Adam's days. And that was long before the flood of Noah's days.
Take a look at the example of the nations of Gen.10, specifically those of Canaan, the son of Ham, the son of Noah.
The sons of Canaan were Sidon, Heth, the Jebusite, the Amorite, the Girgasite, the Hivite, the Arkite, the Sinite, the Arvadite, and the Zemarites, and the Hamathites.
When we get to Genesis 15 about the peoples of the land of Canaan, there's a problem that appears, because The LORD mentioned 4 peoples among the Canaanites that no previous lineage from Seth, Ham, or Japeth was given ...
Gen 15:18-21
18 In the same day the LORD made a covenant with Abram, saying, Unto thy seed have I given this land, from the river of Egypt unto the great river, the river Euphrates:
19 The Kenites, and the Kenizzites, and the Kadmonites,
20 And the Hittites, and the Perizzites, and the Rephaims,
21 And the Amorites, and the Canaanites, and the Girgashites, and the Jebusites.
(KJV)
You will NOT find any lineage for those four peoples in bold going back to the sons of Noah.
One of the biggest standouts of those four peoples in bold NOT descended from Noah's sons were the Rephaims. Here's what the International Standard Bible Dictionary says about those Rephaims ...
REPHAIM
(ref'-a-im), (re-fa'-im) (repha'-im, from rapha', "a terrible one "hence "giant," in 1 Chron 20:4, yelidhe ha-rapha', "sons of the giant"; the King James Version, Rephaims): A race of aboriginal or early inhabitants East of the Jordan in Ashterothkarnaim (Gen 14:5) and in the valley of Rephaim Southwest of Jerusalem (Josh 15:8). They associated with other giant races, as the Emim and Anakim (Deut 2:10-11) and the Zamzummim (verse 20). It is probable that they were all of the same stock, being given different names by the different tribes who came in contact with them. The same Hebrew word is rendered "the dead," or "the shades" in various passages (Job 26:5 m; Ps 88:10 m; Prov 2:18 m; 9:18 m; 21:16 m; Isa 14:9 m; 26:14,19 m). In these instances the word is derived from rapheh, "weak," "powerless," "a shadow" or "shade."
(from International Standard Bible Encyclopaedia, Electronic Database Copyright ©1996 by Biblesoft)
The below verse reveals Rephaims was not just simply a name for a valley only, but that they were a people of whom a valley was named. In other Scripture they are associated with the 'giants', the name Rephaim actually being a proper name for the 'giants'.
Gen 14:5
5 And in the fourteenth year came Chedorlaomer, and the kings that were with him, and smote the Rephaims in Ashteroth Karnaim, and the Zuzims in Ham, and the Emims in Shaveh Kiriathaim,
(KJV)
So when we were taught in Sunday School that all the peoples that made up the various nations after the flood descended from one of Noah's three sons of Seth, Ham, or Japeth, God's Word actually reveals that assumption is not really correct.
There is no documented lineage of those Kenites, Kadmonites, Rephaim, and Perizzite peoples from the sons of Noah.
To keep to the tradition of men that says all peoples after the flood descended from Noah, one must 'assume' those four peoples whose lineage origin is not documented in God's Word are from Noah's sons. With one of them, like the Rephaims, we pretty well already know per Scripture they definitely were NOT of Noah's sons at all. Many scholars will go ahead and simply add the Kenites, Kadominites, and Perizzites to the list of Canaan's sons, even though God's Word does not document it, their obviously being swayed by the tradition that all peoples descended from Noah after the flood. They have to do that well knowing they are not Biblically accurate in doing that.
I cannot do what they do, because I well know God gave those lists for a very good reason, otherwise they wouldn't be written there as such. So those who want to keep to the tradition of men that all peoples descended from Noah after the flood can do so if they wish, but I will not. I cannot deny what God is pointing to there, especially with the giants known as the Rephaims.