To be more exact, id the creation story is a 'myth story', it means it IS a 'story'. There were no actual, factual, historical 'Adam and Eve' and no 'original sin'
The myth is a story to explain that indeed God is the source of creation and formation of humans - whether, as science tells us, by an evolutionary process, or whatever; and that humans cause most of our own problems.

But the fact remains: the story IS a 'myth'. It is not 'history'. There was no 'sin' to be 'inherited'.