Sir James Frazer speculated that the original oral myth…

““Sir James Frazer speculated that the original oral myth about the Garden of Eden was not about a Tree of Knowledge and a Tree of Life, as found in Genesis, because they are not a polar pair.164 Myths repeatedly seek out polarities whenever possible—day and night, sun and moon, heaven and earth. It would be unlikely that the original myth had two trees that were not polar, as is the case with the Tree of Knowledge and the Tree of Life. Rather, Frazer suggests, the two trees were likely the Tree of Life and the Tree of Death.165 According to his theory, God gave Adam and Eve a divine test to determine if mankind would be mortal or immortal. God wanted them to be immortal,166 so He gave them a big hint: “Don’t eat from the Tree of Death!” Of course, human nature being what it is, that is exactly what they did, thus becoming mortal. If the fruit that Adam and Eve had first tasted had been from the Tree of Life, they would have lived forever, but having eaten from the Tree of Death, they could no longer be permitted access to the Tree of Life. That is why God stationed east of the garden of Eden the cherubim and the fiery ever-turning sword, to guard the way to the Tree of Life (Gen. 3:24). If Frazer is correct—and his theory has the ring of truth—it suggests that the original purpose of the myth, to provide the origin of death, was replaced by a shift to ethical issues, seeing the events of the Fall primarily as a sin against God. This would indicate that this biblical myth was considerably changed from its oral version when the text of Genesis was edited.””

— Howard Schwartz