“There is no “historic Catholicism” either.”
No. The Catholic faith has a contiguous history stretching back to Christ and the Apostles. Protestantism has a “history” stretching back no further than Luther - which means it has almost no history at all - and it is a “history” fraught with relativistic and subjective twists and turns showing it is nothing but a man-made group of sects.
IF this were true; there would be EVIDENCE of it: not conjecture.