That’s right because they can’t discern when it’s metaphor and not.
If the literal interpretation of a passage, as in eating blood, contradicts the weight of clear teaching of the rest of Scripture that forbids it, then it’s a clue that the literal interpretation is not correct but that’s it’s a metaphor.
Genesis is an historical account. To take the first few chapters as metaphor or figuratively and then switch midstream and take the rest as literal is poor hermeneutics.
If the first 11 chapters of Genesis are figurative, and there’s nothing in the passages that indicates they are, then the rest of the book ought to be interpreted that way.
That means that all from Abraham through the Exodus is metaphor or figurative as well.
Actually, this is an allegory, not a metaphor. Metaphors are rarely used in the Gospels. A metaphor is a comparison of of unrelated objects and actions. An allegory is a deeper comparison to reveal a deeper or hidden relationship. The word metaphor is derived from the Latin "Metaphora", meaning carrying over. Allegory is derived from Latin "Allegoria", meaning figurative or veiled language.
Peace be to you.