It is very interesting that evidence of written human records goes back as far as about 5000 years but no further. This says a lot about the Biblical truth of the Noah flood that wiped everything out except for Noah and his family and the animals. Doesn’t really directly point to Adam but does verify Biblical accuracy.
Writing goes back farther than that.
Michael Cremo of “Fobidden Archaeology” says that modern man has been around for possibly up to a billion years based on evidence not accepted by the establishment.
There is cuniform that talks of people before the Flood, and that some of the writings survived.
Perhaps Adam and Eve were just the first homo sapiens: a conscience, sense of right and wrong tuned to that conscience, awareness of death, belief in an eternal soul and an afterlife. After all there had been hominids (homo erectus) around for a long time. I think that there still are some Neanderthals, both male and female, still roaming our cities. Maybe I'm being harsh.
According to the studies of humans, there were several specials of hominids that didn't survive. I assume that the older and failed hominids didn't believe in a Higher Being or God.