twopart question
what is the most viable way to make the Papacy a politically powerless figurehead of Christianity (about as powerless as the Japanese emperor doing sengoku/shogunate)
what (if any) changes would this do in present day? ... for one i'm guessing less slightly better relationships between Christianity as a whole, and the rest of the world since there wouldn't be any religious crusades (or at least not nearly as dolled up as religious in context), and secondly the churches would probably be more autocephalous, hence seen case-by-case even if they all(?) pay lip service to a papal throne