To assume "the church" is the one which has it's headquarters singularly in Rome --- is to assume wa-aay too much which is not established in scripture, or WAS the identification just what "the church" was, and was composed of, in the very earliest understandings and tradition of "the church", either.
There is both an invisible Church and a visible Church. The visible Church is whom St. Paul addressed his epistles to.
If you think the visible Church is something else than the Catholic Church.. Well I’m not going to follow you there. It surely isn’t the Baptist Church of Dallas.