Well, FYI, the Holy Koran refers to Adam as exactly that, the “first prophet” of The One True God in the heavens
Moreover, Adam & Eve “communicated with (the one true) God”, which is the definition of being a true “prophet”, and actions speak louder than words?
I guess the term “priest” is probably too tied up with the notion of a physical temple location, on second thought, I’d like to retract the term “priest” and simply suggest “prophet”
I think there is solid “pan-Abrahamic Religious” basis for considering A&E the “first prophet & prophetess” who communed directly with heaven
some other things to think about, the transition from a forest-like environment of fructivorous vegetarianism, to one wherein animal blood is spilled to provide humans animal-hide clothing, corresponds accurately to the transition from chimpanzee-like Australopithecines to the first stone-tool using, fire-wielding, meat-eating homo habilis 2-3 million years ago.
Then, the curse of Adam to “work the land by the sweat of your brow”, from a previous existence of (hunting and) gathering, resembles the Agricultural Revolution 10-20 thousand years ago
And, corroboratingly, the conflict between city-dwelling Cain and free-ranging Abel resembles the ensuing conflict between burgeoning farming populations with those “conservative” hunter-gatherers around them, 5-10 thousand years ago
The text easily aligns with the scientifically-accepted time-line of homonid-to-human development over the past 2-3 million years…
although it does so according to an extremely non-linear (logarithmic???) notion of time, wherein scant words sweep us forward millions of years, and the next sentence or so thousands more
As Genesis unfolds further, the ratio of “Scriptural words to linear historic earth time” continues to increase, as more & more verses are devoted to the doings & deeds of Noah, Nimrod, Abraham & the Patriarchs, and so on…
Someone really “ought to” try to plot this out, I hypothesize that it traces out a nice logarithmic curve