Catholicity

Catholicity is not defined by union with the Roman papacy, but rather by union with Christ through the Spirit and faith in the gospel. This is what the Bible teaches in passages like Ephesians 2:19-22 and 4:1-16. The catholic (i.e. universal) church is composed of those who share "one Lord, one faith, one baptism" (Eph. 4:5). Notably, in Ephesians 2:19-22, the church is not built upon the successors of the apostles (or successors of Peter in particular) but upon the apostles themselves, along with the prophets, Christ being the cornerstone. The apostolic and prophetic foundation is not to be found in a pretended successor like the pope, but rather in the divinely inspired writings they left behind - the Bible - which finds its center in Jesus Christ, the cornerstone. May all who claim the name of Christ abandon other foundations for the church and build their house on the rock. Upon this rock, Christ will build His church. All other ground is sinking sand (Matt. 7:24-27).