A scene from my novel, Factions of a dWARf, mocks rebirth therapy; in which, psychoanalysts have their patients re-experience birth. The TV series Monk had the title character remember the trauma of childbirth, for laughs. It’s difficult to to take such therapy seriously.
There is reason to begin at the beginning, though. My novels involve a genetic memory drug and it’s unpredictable what memories would come to the surface and what manner they would appear, but I began at the beginning and moved forward in time for simplicity, sake. If god exists, evolution is more credible as an origin story than Adam and Eve, so I began with the origin of life and moved forward.