If every single story is a myth, that would suggest that humans are the only source of wisdom and guidance unto themselves.
To believe in a story as other than a myth is to believe that human reality is in contact with wisdom that is not human. (or is superhuman, or beyond mere human)
What do you think, DG? Do you think that it is possible that moral law transcends human fallibility?
Why would humans invent a story about a standard that we never could reach?
Why does the solution involve God pulling us out of the fire at the moment of our surrender to helplessness?