Church... and that Church is the Catholic Church. That is just a fact that is backed up by logic, by history and by the bible.
If you look at what the earliest Christians wrote it lines up with what the Church still teaches.
Uniquely Protestant doctrines did not spring up until Martin Luther penned his 95 Theses in 1517.
The two pillars upon which protestantism is founded, "sola scriptura" or "bible alone" and "sola fide" or "faith alone" are ironically enough not biblical. Sola Scriptura maintains that all doctrines must be in the bible, and yet that is taught nowhere in the bible. It is self-refuting.
In similar fashion, there is only 1 place in all of the Sacred Scriptures that "faith alone" is mentioned, and that is in the book of James
24 You see that a man is justified by works and not by faith alone. James 2:24
https://www.biblegateway.com/passage/?search=James+2%3A24&version=RSV