In Roman Catholic theology, Sententia certa refers to teachings without final approval but clearly deduced from revelation. These are below the Sententia fidei proxima level, but above Sententia communis.
Adam and Eve being the Mother and Father of the Human Race is Sent. certa.
Does this not leave open the possibility of a different interpretation involving polygenism?
Regarding the conflict between Adam and eve and science, the theory that i have come up with is that God did create more “people” a population of which Adam and eve were a part of genetically. But only Adam and Eve fell from Grace and only Adam and eve had children, thus original sin begins with them and was passed on to their children and every human being since then.