I just made the simple observation that the earlier back you go in the Bible, the harder it is to believe or understand.
Perhaps the reason for that is to always help people in whatever era they may live in.
Except the Genesis is not as old as you think.
There are no writings in Hebrew exist in the Bronze Age (c 3100 - c 1050 BCE).
The story was composed between 630 and 550 BCE, adapting the Assyrian-Babylonian flood story that was known at that time, for Hebrew readers.
And while the story was written in the middle of the Iron Age, the scene was set in earlier time, like in the later half of the 3rd millennium BCE. But I need to remind you, no such flood occurred in that millennium, but this is where the Babylonian stories of Gilgamesh and Utnapishtim originated with the 3rd millennium Sumerian literature.
So historically, there was no such flood, because we have both archaeological evidence and historical records of unbroken continuities of Sumerian-Akkadian culture and Egyptian culture (Old Kingdom period) in this millennium.
If there were really such a flood, then there should have been a break in continuity of these two kingdoms and cultures, but no such break exist in this millennium.
Second, there are so many unrealistic things about the Flood narrative, if taken literally.
So there must be another purpose for writing this unbelievable tall tale, and should be interpreted symbolically (or metaphorically) like allegory or parable, where the story isn’t about historical or scientific accuracy, but about conveying moral messages or moral wisdom - an instructive teaching.
The Eden and Flood stories are indeed far more complex than Jesus’ simplistic parables, but still allegories.
The Epic of Gilgamesh, and the hero’s visit with Utnapishtim, is likewise, an allegory with meanings - it too, have moral messages.