Westminster Confession Of Faith – Lord’s Day 42
Chapter 25 – Of the Church Cont. (Paragraphs 4-6)
IV. This catholic Church has been sometimes more, sometimes less, visible. And particular Churches, which are members thereof, are more or less pure, according as the doctrine of the gospel is taught and embraced, ordinances administered, and public worship performed more or less purely in them.
V. The purest Churches under heaven are subject both to mixture and error: and some have so degenerated as to become apparently no Churches of Christ. Nevertheless, there shall be always a Church on earth, to worship God according to his will.
VI. There is no other head of the Church but the Lord Jesus Christ: nor can the Pope of Rome in any sense be head thereof; but is that Antichrist, that man of sin and son of perdition, that exalts himself in the Church against Christ, and all that is called God.