Jesus did say, “Your word is truth”, in prayer to God so what did he mean if not what he said?
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I’m not trying to be dense, but I don’t read those words as saying “The Genesis creation account is 100 percent literally true”.
Frequently when the Genesis account is discussed it is called allegorical. Rather in the same vein the story of the ant and the grasshopper story.
No one would say that tale was true or truth whatever the underlying meaning, in fact, like the three little pigs story, it was deliberately fantastic since the teller would not want anyone to take it as a truth but pay attention to its meaning.
Jesus frequently did use parables as a teaching device but when he did so it clearly that by the wording. Hence both Peter and Paul spoke of the Genesis account not as a parable but as a historical example, of truth, of God's actions.
For example Paul compares and contrasts Christ and Adam. And points to Adam's error as the source of human death. Rather difficult for an allegorical chracter to bear such blame.
Jesus himself said of the Genesis account, “Have you not read that He who created them in the beginning...?” and
then quotes Genesis 2:24 as the reason a man and woman should remain married.
The Genesis account was part of that “word” that Jesus quoted and called “truth”.
If it is an allegory with some underlying story then what would that story be? Who do the characters represent and what do their actions represent? Who is God, Adam, Eve, Noah, etc. an allegory of? If a mix of literalness and parable or allegory what part is which and how? If part is outrightly false, what part is that and how?
Somehow when the throw away statement is made that, “it's an allegorical story” such questions are not addressed.
And quite frankly, how we read it is of far less importance than how Christ took it if we claim to be one of his followers.
Well, one has to consider that the account in Genesis is like reading the pages of Cliff Notes of "War and Peace" in random order, with no references.
It may be 'true', but one had to be there to really understand it.