This has led to the use of some “if’s” such that “if” the Pope is not doing what is delineated in the Confessions, then he is not the antichrist, just the office is?
The difficulty with that explanation is that the term Antichrist applies to a person not an office.
The Antichrist is mentioned by name in only four verses of Scripture: 1 John 2:18, 22, 4:3, and 2 John 7. There are other verses that many people link to the Antichrist, but since he isn’t named in them, the connection is not certain. The four Johanine verses must serve as the core of our knowledge before trying to link other verses to them.
In 1 John 2:18–19, we read, “Children, it is the last hour; and as you have heard that antichrist is coming, so now many antichrists have come; therefore we know that it is the last hour. They went out from us, but they were not of us; for if they had been of us, they would have continued with us; but they went out, that it might be plain that they all are not of us.”
This passage appears to speak of a major individual Antichrist, as well as many minor individual Antichrists, who apparently are apostate Christians for “they went out from us.” The appearance of the individual Antichrist is yet future (“Antichrist is coming”), but the presence of the many Antichrists is a signal that “it is the last hour.”
In 1 John 2:22–23, we read, “Who is the liar but he who denies that Jesus is the Christ? This is the antichrist, he who denies the Father and the Son. No one who denies the Son has the Father. He who confesses the Son has the Father also.”
This is consistent with the apostate nature of the many Antichrists, for they have “deny[ied] that Jesus is the Christ” and, in denying the Son, they have implicitly denied the Father. Presumably the same would be true of the individual Antichrist.
1 John 4:1–6 gives practical tests for discerning which spirits bearing revelation are from God and which are not. In John 4:3, we read that “every spirit which does not confess Jesus is not of God. This is the spirit of Antichrist, of which you heard that it was coming, and now it is in the world already.”
This shows that the Antichrist movement is inspired by spirits bearing false revelation and that refuse to confess Jesus. This movement had begun in John’s day but would grow afterward.
Finally, in 2 John 7, we read, “For many deceivers have gone out into the world, men who will not acknowledge the coming of Jesus Christ in the flesh; such a one is the deceiver and the antichrist.”
Nothing there about the pope (any pope!) or the papacy.