The reversal of the principle of burden of proof in favor of those who claimed authenticity of material that was obviously and thoroughly shaped by faith in the continued presence of Jesus after his death did not happen by way of methodological argument but by way of decree.
The creation and Adam and Eve narratives are often said to be nice moral tales that convey spiritual truths. Being myth does not disqualify them from containing meaningful messages for modern readers.
So at wedding ceremonies and in Sunday school classes bible-believers are regaled with the “beautiful story” of the God practising a bit of psychic surgery as his hand penetrates Adam’s side to pull out a rib which he used to create Eve. And since this story is not something that has been uncovered in modern times among cuneiform tablets alongside myths of sea-monsters and sky-gods, but is one we have been as familiar with as our soft pillows and teddy bear toys since childhood, we call it a “beautiful metaphor” of the marriage relationship.
And I suspect many theologians would prefer to keep it that way. Meaningful myth or symbol is sophisticated. Literal images of God taking the penis bone from Adam and using it to create Eve, thus explaining both marriage and the reason males of humans alone (almost) lack this bit of anatomy would probably go a long way to discrediting not only a “beautiful and meaningful story”, but opening up a few more people’s minds to the irrelevance of the Bible in an enlightened age.