Thats actually the argument I make, if you dont believe literally the genesis creation myth, adam and eve, the fall in the garden, the covenants, and the divinity of christ, then you might call yourself Christian, but really youre just a new age hippy dippy playing big book of multiple choice with what is supposed to be gods holy word.
But the Joseph Campbell books on myth and the heros tale and its broad applicability to every major human faith structure does give them a sort of out, because he essentially is saying that this story is an archetype meant to relay paths to personal progress, and therefore whatever culturee you belong to's overarching mythos is functionally relaying these lessons and so it doesnt matter if youre Christian or buddhist or bahai or following odin or quetzcoatl, all are paths to spiritual growth wih or without takig them as literally true.
so even like modern myrhology like fantasy fiction relays the same sort of spiritual message, in this worldview.
I think its apologetics and accomodationist tripe, but to each their own I suppose.