The speed of light, stars, and YEC?

[tackattack]

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I might be able to see if I understood how a metaphoric fall from grace would work. Can you help me out here?

I think he is pointing out the fact you are committing a composition fallacy. Just because there are allegedly aspects of Genesis that are figurative, does not necessitate that all parts of the story are indeed figurative (i.e. the fall).

yup, what he said

Actually, that wasn't my point, that one part being figurative means the whole book is.

What I need to understand is how a proverbial fall from grace needs to be paid by a real sacrifice on a cross (putting aside how blood sacrifice makes sin go away in the first place).

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I hoped your point would be better than reitterating the initial fallacy which I addressed and will again.

Fallacy Of Division:
assuming that what is true of the whole is true of each constituent part. For example, human beings are made of atoms, and human beings are conscious, so atoms must be conscious.

Your observation also boarders Argument By Generalization. One part being figurative doesn't means the whole book is, it just mean that that one part is seen as figurative. It doesn't mean it didn't happen, just that it isn't believed to have happened exactly as described. For an example from an elementary school workbook:
Literal: I can’t find my keys and I keep forgetting appointments.
Figurative: My mind is oatmeal.
Both reference an actual occurance (forgetting the keys). I'm aware most atheists and some theists see this as cherry picking as well, but that's not what this is about. It's not proverbial in that it's not illustrating a proverb or common saying. It's figurative in that it is a metaphor, during an unrecorded time in man's history, for the struggle between human nature and God's will.

To answer your question of contrast in this figurative story and the literal sacrifice of Christ; a real fall from grace needs a real atonement, regardless of how it's conveyed, described or the language used.