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I've seen the claim that Paul VI was the antichrist. If the antichrist is defined as someone who leads the entire world into error, that would have to be Paul VI. But none of the other prophecies about the antichrist seem to have been fulfilled in him, especially not the coming Enoch and Elias, and he has been dead for over 40 years and the world hasn't ended yet, so I have to conclude it wasn't him.
St John defined antichrist as he who denies Christ.
"Little children, it is the last hour; and as you have heard that Antichrist cometh, even now there are become many Antichrists: whereby we know that it is the last hour."
1 John 2:18"Who is a liar, but he who denieth that Jesus is the Christ? This is Antichrist, who denieth the Father, and the Son."
1 John 2:22"And every spirit that dissolveth Jesus, is not of God: and this is Antichrist, of whom you have heard that he cometh, and he is now already in the world."
1 John 4:3"For many seducers are gone out into the world, who confess not that Jesus Christ is come in the flesh: this is a seducer and an antichrist."
2 John 1:7So anyone who denies Christ is an antichrist. But also the Antichrist is a specific historical person (either past, present or future) who fulfills the prophecies contained in Sacred Scripture concerning the end times. This person will deny Christ and persecute Catholics in the final days. But there are some specific prophecies in St John's Apocalypse relating to the Antichrist which JP2 very closely tracks. If you want to see the specifics, go to the schismatic-home-aloner channel on YouTube. They have a few videos on this topic both about the Apocalypse/Revelation and about JP2.