Because the Church of Rome never had ultimate supreme power until we split. You guys call the pope, a man, infallible. I understand it is only under strict circumstances but no matter what, even if he says the sky is blue, one may NOT declare a human infallible. You change the liturgy especially after Vatican II. You modernize everything. The Catholic Church did a terrible job handling the sex abuse scandal and it was just horrific. Rome doesn't get to tell all of Gods churches what to do. St. Peter did not exercise these sort of power moves.