It used to be an official teaching that Genesis had to be accepted literally, that there was a Garden of Eden, that Adam and Eve were directly “created” from dust (and rib

) and that there was a literal Tree of Knowledge, and a snake… and all that good jazz. (Of course there would have been a neat question: “who did the record keeping of the events there?”… but let’s not get into it right now).
Of course it went hand in hand with the command of staying away from that “tree”, and then the talking snake convinced poor Eve to taste that forbidden fruit and the rest is “history”.
These days, however, the winds are a-changing. Believers are not required to believe the literal story, if they don’t want to. But this freedom bings up more questions: “what actually transpired which was the original sin”? If there was no Garden, no Tree, no snake, no apple, no command… then what actually happened? Any explanation? Or is the “original sin” is just another piece of mythology these days?
It has never been an official teaching that Genesis had to accepted literally.
“For who that has understanding will suppose that the first and second and third day existed without a sun and moon and stars and that the first day was, as it were, also without a sky? . . . I do not suppose that anyone doubts that these things figuratively indicate certain mysteries, the history having taken place in appearance and not literally” - Origen, 225 A.D.
But no early Church Father spoke more frequently and expansively on the topic than St. Augustine (who is also considered a Doctor of the Church):
“It not infrequently happens that something about the earth, about the sky, about other elements of this world, about the motion and rotation or even the magnitude and distances of the stars, about definite eclipses of the sun and moon, about the passage of years and seasons, about the nature of animals, of fruits, of stones, and of other such things, may be known with the greatest certainty by reasoning or by experience, even by one who is not a Christian. It is too disgraceful and ruinous, though, and greatly to be avoided, that he [the non-Christian] should hear a Christian speaking so idiotically on these matters, and as if in accord with Christian writings, that he might say that he could scarcely keep from laughing when he saw how totally in error they are. In view of this and in keeping it in mind constantly while dealing with the book of Genesis, I have, insofar as I was able, explained in detail and set forth for consideration the meanings of obscure passages, taking care not to affirm rashly some one meaning to the prejudice of another and perhaps better explanation” - (The Literal Interpretation of Genesis 1:19–20 [A.D. 408]).
“Seven days by our reckoning, after the model of the days of creation, make up a week. By the passage of such weeks time rolls on, and in these weeks one day is constituted by the course of the sun from its rising to its setting; but we must bear in mind that these days indeed recall the days of creation, but without in any way being really similar to them” (ibid., 4:27).
“[A]t least we know that it [the Genesis creation day] is different from the ordinary day with which we are familiar” (ibid., 5:2).
“For in these days [of creation] the morning and evening are counted until, on the sixth day, all things which God then made were finished, and on the seventh the rest of God was mysteriously and sublimely signalized. What kind of days these were is extremely difficult or perhaps impossible for us to conceive, and how much more to say!” (The City of God 11:6 [A.D. 419]).
“We see that our ordinary days have no evening but by the setting [of the sun] and no morning but by the rising of the sun, but the first three days of all were passed without sun, since it is reported to have been made on the fourth day. And first of all, indeed, light was made by the word of God, and God, we read, separated it from the darkness and called the light ‘day’ and the darkness ‘night’; but what kind of light that was, and by what periodic movement it made evening and morning, is beyond the reach of our senses; neither can we understand how it was and yet must unhesitatingly believe it” (ibid., 11:7).
“They [pagans] are deceived, too, by those highly mendacious documents which profess to give the history of [man as] many thousands of years, though reckoning by the sacred writings we find that not 6,000 years have yet passed” (ibid., 12:10).