The Roman Catholic Church is an example of a degenerated synagogue of Satan which the Reformers wrote and fought against. They finally lost any title which they had of a true church when they declared the Gospel of Sola Gratia anathema in the Council of Trent in response to the Protestants:
CANON XI.-If any one saith, that men are justified, either by the sole imputation of the justice of Christ, or by the sole remission of sins, to the exclusion of the grace and the charity which is poured forth in their hearts by the Holy Ghost, and is inherent in them; or even that the grace, whereby we are justified, is only the favour of God; let him be anathema.
This is the Gospel and Rome has rejected it, so how can it be a true Church of God if it rejects the Gospel of God? This is not to mention all things about Mariolatry, all kinds of non-biblical doctrines as Purgatory, priesthood, papacy, salvation by works and faith, penance and so on. All these things exclude the Roman Catholic Church from being a true Church of God. They may claim Christ, but Christ does not claim them since they are a synagogue of Satan. Furthermore, the understanding of the church between Protestants and Papists is vastly different. The conception of the Catholics is more “physical” and organizational than the spiritual conception of Protestants.
No matter these synagogues of Satan and the churches whose doctrine is mixed with truth and error, the Lord Christ, as Sovereign over all, will always have His Church on earth which consists of those who are true to Him and call upon His Name. No matter the difficulties, the Lord's word still stands fast: I will build my church, and the gates of hell shall not prevail against it (Matt. 16:18). No matter what Christ will have a people who are true to Him and call upon His Name. No matter how difficult things get or how severe persecution is, Christ is ever-victorious and His people are more than conquerors in Him (Rom. 8:37). The best and flourishing times of the Church, paradoxically, is in its times of persecution and difficulty. As Tertullian so long ago said, "The blood of the martyrs is the seed of the church." We see the Lord Christ praying to the Father to protect us within persecution and not take us out of it. The Lord prayed, “I do not ask that you take them out of the world, but that you keep them from the evil one” (John 17:15).
§4 The Lord Jesus Christ Is The Head Of The Church
- The Lord Jesus Christ is the Head of the church, in whom, by the appointment of the Father, all power for the calling, institution, order or government of the church, is invested in a supreme and sovereign manner; 1 neither can the Pope of Rome in any sense be head thereof, but is that antichrist, that man of sin, and son of perdition, that exalteth himself in the church against Christ, and all that is called God; whom the Lord shall destroy with the brightness of his coming. 2 (Colossians 1:18; Matthew 28:18-20; Ephesians 4:11, 12; 2 Thessalonians 2:2-9) ...