Was Earth Populated from Incest Marriages?
NO!!
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Because incest marriages are against God's instructions! Here is what God said about brother and sister marrying each other:
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Leviticus 20:17
If a man marries his sister, the daughter of either his father or his mother, and they have sexual relations, it is a disgrace. They are to be publicly removed from their people. He has dishonored his sister and will be held responsible.
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Although the Bible only described the creation details of Adam & Eve, it does not mean God did not create other people the same way! No need to speculate about the children of Adam and Eve marrying each other. Here's a reference that explains it:
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Genesis 1:27-28
27 So God created mankind in his own image, in the image of God he created them; male and female he created them. 28 God blessed them and said to them, “Be fruitful and increase in number; fill the earth and subdue it...”
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This Bible reference was in the 1st chapter of Genesis, the part of Genesis where creation was being described in general terms. The specific details of creating Adam and Eve came later in Genesis 2.
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So based on this "scripture in general terms" in Genesis 1, examples, "Created mankind", "created them male and female", "blessed them", and "told them to be fruitful and multiply...", meant He created others the same way as Adam & Eve. It is just that the Bible only provided the details of the Adam & Eve account because they were the lineage of the Messiah, the ancestors of the Jews and Jesus Christ. The answer is simply that the Bible did not get into the details of creating the others.
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Obviously Adam & Eve were the first couple. Then following the order of events described in Genesis, it would make the most sense that God created others after the fall, that is after Adam & Eve were expelled from the Garden, which was also when Eve became pregnant with her first child as described in Genesis 4:1 Adam made love to his wife Eve, and she became pregnant and gave birth to Cain. It is likely that it was around that time that God created others, in the same state of "knowledge of good and evil" as Adam & Eve. It was not specifically noted in the Bible, but it is consistent with God's ways and personality.
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Was it too difficult for Him to create more people? Of course not! Would He create others to avoid disgraceful incest marriages?! Of course He would!!! There is no evidence against it! God creating more people even further explains the variety of races and ethnicities. So no need to trip all over ourselves trying to explain how black Africans evolved to become Asian or Northern Europeans, or vv.. God created the various types of people! You ask, what about Noah's flood? Noah, his wife, his son's, and their wives on the ark, were from different tribes and carried multiple genes. Then repopulated the earth.
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