How do you decide which stories contain truth and which don’t? I think an important ingredient is the teaching of Jesus Christ and the belief that He is God’s Son, isn’t it?
Peter (2 Peter 2:5; 1 Peter 3:20) makes it clear that only eight people of the ancient world were saved from Noah’s flood.
Scientific history makes it clear that at about 3,000 BC:
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The region of the so called five antediluvian cities in Sumer was flooded.
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About 100,000 people lived in this region.
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All over the world outside Mesopotamia lived a Homo sapiens population of about 14,000,000 individuals.
From this it doesn’t follow that "either Peter got it wrong or history is wrong”, as you seem to conclude. You interpret Peter using the concept “global” as “Westerners” use it today. Such a concept is not appropriate to understand the truth contained in Peter’s letters. By claiming “Peter makes it clear Noah’s flood was global” you convey the idea that according to Peter “all Homo sapiens living outside the Ark perished in the Flood”. I dare to say that by interpreting Peter this way it is rather you who is “forcing Scripture” to conclude that “it does not fit history”.
Since Peter’s Epistles are writings of the New Testament it is fitting to assume that Peter is speaking from the perspective of people who are endowed with free will and thus are aware of God’s law. Then it suffices to assume that the 14,000,000 Homo sapiens outside Mesopotamia were endowed by God with free will only at the end of the Flood (in accord with Genesis 9: 3-6) and the contradiction disappears. By the way, your assumption that “God created Adam and Eve at about 50,000 BC” implies also that God endowed with free will a large population of Homo sapiens at some point between this time and the Flood.
This does not mean “forcing Scripture to fit history” but simply taking seriously Peter’s Inspiration and the scientific data, and then using logic to avoid falling into contradictions. Thereby we discover a truth which is contained in Genesis but we can only “see” today in the light of the new scientific data. And this is precisely what means that Scripture is inspired by God: Revelation will always surprise us with new truth (just like science!).
I refer to Genesis 6:2-4 primarily because of the “sons of God” and not the “Nephilim”.
You are fully right: there are “several versions of what it means and while each version makes sense, none agree with the others.”
This confirms what I have previously said: Scripture contains truth that is waiting to be discovered in the light of what science is telling us today.
I think it is worth discussing more in depth what these “sons of God” mean. According to me this episode supports my interpretation that the transformation of Homo sapiens creatures into human persons endowed with free will and capable of sinning was still happening at the time of the Flood: It was a gradual process that started with the creation of “Adam and Eve” and was completed at the end of the Flood.