Pure hogwash. Thats liberal theology that limits the power of God and his inspiration. God is apparently not strong enough to inspire Moses and the prophets to write truth. Somehow Moses is too dumb, despite being in the very presence of God to get it. You say "of course we know what happened", yet claim so much of scripture is myth. If that is true you don't know what happened. The entire event on mountain, God meeting with Moses and the whole golden calf thing may not have happened at all. It's all just a story to portray a greater truth, perhaps that God is the only God and no one should worship anyone else. It's just a story to explain how serious God is about that.
I, in fact, am quite careful not to call it a myth and am explicit that what was written down is from direct influence from God... did you miss that because I'm confused by your comments?
This is simply how Ancient Eastern culture works, they start with the goal and fill the details to meet the goal, the details are true because the goal is worthy of them being true and it being literal or not has less value. Western culture uses the facts to prove the hypothesis and this is the highest form of truth but it's is going to be incompatible with many Eastern accounts (like the creation accounts) and will completely miss the point.
The creation account is 2500 years removed from Moses and it would have had high competition and influence from surrounding cultures. That's like writing the gospels for the first time today having only oral knowledge passed down of it and a pile of different versions circulating around.
It is clear the Hebrews had mass theology misgivings post-exodus but why wouldn't they? They had no scripture, no temple, no priest, no leader (prior to Moses) and no organized religion. Their most coveted and unique accounts would have been Abraham Issac and Jacob and they would have the highest accuracy since it was uniquely their undisputed history... but pre-Abrahamic accounts would have high competition and influence from surrounding cultures. If this was anyone other people group/religion we would laugh at these accounts, labelling them immediately as myth and toss them out.
I don't call them myth but I recognize the myth likeness they carry. Instead, I see God divinely inspiring Moses to present a redeem de-paganized account, highly contextualized, with deep-seated truth to proclaim that God is the creator of all things explicitly rejecting any paganized thinking and implicitly rejecting other competing accounts like the Egyptian creation myth that is very similar to Genesis (but it's older).
Idol worship and pagan ways were a mass problem. Look at what Moses came down to, the high priest of God making an idol, claiming it made itself and everyone worshiping it. Now, what are the first commandment and second commandments? Not to mention the 40 years of wandering in the desert to cleanse the old ways out of them. The creation account is about correct theology not about over literal facts, but this doesn't make it any less truth or real. We don't get it, because we develope our theology form other parts of the bible and the creation account acts as a way to affirm them but this wasn't the purpose of it. The creation account on the surface is about rejecting gods and affirming God and the creator of all things but goes far deeper than this.
to me, literalists have a far greater demand to prove their position but they write the argument off as blasphemous, or what did you say "hogwash", and in doing so miss the grand depth of the account. I personally think I place greater value upon the words of the creation account over any literalist does.