I think it's fairly clear that there's some things in old folks' cultural wisdom and religious teachings that may be applicable today, just as there's a large amount that absolutely isn't. While our understanding of medicine evolves from blaming demons to blaming microbes, and we go from sacrificing virgins and goats to sacrificing our time and effort, so should every other previous notion be updated to fit our current surroundings and societies. What mechanisms are there, apart from science, to do that?

Flat earthers are a good example of what happens when you discard the science and just go with conventional wisdom and what "feels right". I'd certainly lean towards science being able to answer questions of morality, pretty much the only limitations to that are our knowledge and understanding. It's a simple algorithm really: which option minimizes net suffering (priority 1) and maximizes net happiness (priority 2).