Lutheran Smalcald Articles, Article IV: Of the Papacy.
"This teaching shows forcefully that the Pope is the very Antichrist, who has exalted himself above, and opposed himself against Christ because he will not permit Christians to be saved without his power, which, nevertheless, is nothing, and is neither ordained nor commanded by God. This is, properly speaking to exalt himself above all that is called God as Paul says, 2 Thess. 2, 4." Martin Luther
Treatise on the Power and Primacy of the Pope: "And all the marks [all the vices] of Antichrist plainly agree with the kingdom of the Pope and his adherents." See Treatise
Calvinist/Reformed/Presbyterian see Chapter 25, Article 6, Westminster Confession (1646) and Chapter 26, Article 4, Savoy Declaration (1658)
"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." Westminster Confession, Chap. 25, Art. 6 See this version with citations to 2 Thess. 2:3,4,8,9; Rev. 13:6
"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 exalteth himself in the Church against Christ, and all that is called God, whom the Lord shall destroy with the brightness of his coming." Savoy Declaration, Chap. 26, Art. 4 (emphasis mine)
[Check your news paper and phone book yellow pages for those Reformed and Presbyterian Churches that follow the Westminster Confession or the Savoy Declaration.]
Baptist (Reformed) See Chapter 26, Article 4 of the Baptist Confession of Faith (London, 1689)
"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; 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." Cites 2 Thessalonians 2:2-9
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Note that the above references to 2 Thessalonians 2:2-9 mean that the Pope/Papacy is not merely "an" antichrist but is THE ANTICHRIST!
Today
RETRACTIONS
The following groups appear to have modified their historic stance
Church of Scotland (Presbyterian) The foregoing link is their third and latest of which I am aware. I can't find the pertinent information on their new site. However, the Church at their former site made the following statement:
"For many the Westminster Confession reflects too much the spirit of its age. Attempts have been made to frame a modern Confession, but so far without success. The Church, however, has dissociated herself from those statements in the Westminster Confession that are hostile to the Roman Catholic Church and to the Pope." As I recall from their even earlier site, their retraction was made in 1984 or 1986!
Presbyterian Church in America. (PCA) Modified Chapter 25, Article 6 of the Westminster Confession to delete reference to the Pope being the Antichrist. Still maintains the other anti-Catholic provisions regarding "Popish monastical vows" (Chap. 22, Art. 7); forbidding marriage to "papists" (Chap. 24, Art. 3); and the "Popish Sacrifice of the Mass" as an abomination (Chap. 29, Art. 2.) Preface indicates "anti-Christ" provision was removed in 1973.
Orthodox Presbyterian Church. (OPC) Modified Chapter 25, Article 6 of the Westminster Confession to delete reference to the Pope being the Antichrist. OPC's version here, apparently the 1936 version, leaves the implication that the Pope may still be the "antichrist" in Footnote 14 with the cites to 2 Thess. 2:3-4, 8-9; Rev. 3:6. These cites were apparently removed in 1978. Still maintains the other anti-Catholic provisions regarding "Popish monastical vows" (Chap. 22, Art. 7); forbidding marriage to "papists" (Chap. 24, Art. 3); and the "Popish Sacrifice of the Mass" as an abomination (Chap. 29, Art. 2.)
Associate Reformed Presbyterian Church (ARPC) Modified Chapter 25, Article 6 of Westminster Confession to delete reference to the Pope being the Antichrist. Also modified Chap. 24, Art. 3 by deleting the forbidding of marriage to "papists." Still maintains the other anti-Catholic provisions regarding "Popish monastical vows" (Chap. 22, Art. 7) and the "Popish Sacrifice of the Mass" as an abomination (Chap. 29, Art. 2) Their latest modification of the Westminster Confession was in 1984!
Presbyterian Church U.S.A (PCUSA) Tentative! Only because I cannot find their version of the Westminster Confession at their site. Extent of retractions/modifications unknown at present. Am assuming are similar to Presbyterian Churches above.
Cumberland Presbyterian Church/Cumberland Presbyterian Church in America Both appear to have replaced the Westminster Confession with their own confession.
Reformed Baptist Church of Grand Rapids. This Baptist Church, which put the 1689 Baptist Confession of Faith on the web, has a disclaimer (scroll down) similar to that of the Presbyterians disassociating itself from the claim the Pope is the antichrist.
It appears that the Lutheran World Federation (LWF) and Evangelical Lutheran Church in America (ELCA) no longer believe that the Pope/Papacy is the Anti-Christ in light of the Joint Declaration on the Doctrine of Justification. This is confirmed by the rabid anti-Catholic Baptist group below, which goes berserk with such articles as Lutherans & Rome Together.