Well Magisterium.com got one thing correct:
The Church teaches that the Antichrist will be a false, counterfeit claimant to the supreme office of the Church, but it does not identify him with any particular historical antipope. The Catechism describes the Antichrist as “the man of sin…who will exalt himself above all that is called God and will lead many to apostasy” (CCC 675)1. This passage makes clear that the Antichrist’s primary characteristic is deception on a cosmic scale, presenting himself as a messianic figure and, consequently, as
the head of the Church.
The Catholic Encyclopedia treats the two terms as distinct:
- Antichrist – “the spirit of deception that denies that Jesus is the Christ and the principal opponent of true faith” (Catholic Encyclopedia, Antichrist)2. The entry emphasizes that the Antichrist is a future, singular deceiver, not a specific papal pretender.
- Antipope – “a false claimant of the Holy See in opposition to a pontiff canonically elected” (Catholic Encyclopedia, Antipope)3. It lists historical pretenders (e.g., Robert of Geneva, Clement VII) and stresses that an antipope is a historical phenomenon, not an eschatological figure.
Patristic writers also keep the categories separate. Irenaeus calls the Antichrist “an apostate…a man of sin” (cf. his discussion of the “man of sin” in 2 Thessalonians 2:3‑4, quoted in the Catechism)1, but he does not link this apostasy to the papal office; his focus is theological—on the denial of Christ—rather than on a claim to the papacy.
Therefore, Catholic teaching can be summarized as follows:
- The Antichrist will appear as a counterfeit pope in the sense that he will try to assume the highest visible authority of the Church and will deceive many Catholics into believing that he is the true successor of Peter.
- He is not a legitimate pope nor an identified historical antipope; the term “antipope” refers to specific false claimants who have arisen in Church history, whereas the Antichrist is a future, singular deceiver whose mission is to supplant Christ Himself.
- The Church’s safeguard against this supreme deception is fidelity to the authentic Magisterium—especially the Pope, the Bishop of Rome, as the perpetual source of unity (CCC 931‑932)—and vigilance in discerning false teachings (CCC 675)1.
In short,
the Antichrist will act like a false pope, using the appearance of papal authority to lead the faithful astray, but the magisterial docuмents do not equate him with any particular antipope; they present him as the ultimate deceiver who will counterfeit the true Petrine ministry.