And before the end of John, an ANGEL had to tell John to write to seven ERROR FILLED 'Catholic' churches!
Great teaching retention so soon after Christ's resurrection!
The errors of the churches in Revelations is that of individual churches, not of the Church as a whole. If the Church as a whole is not infallible then how do we even know what is Scripture and what is not? This is the dilemma of the canon of the Bible that Protestants cannot answer.