From St. John's 2nd letter he says:
"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."
Such "mini" antichrists who deny Christ and practice deceit are the likes of Justin Trudeau, or Gavin Newsome, or Ben Shapiro. I am sure you could name more historically.
Eventually, we'll get the big antichrist as per Revelation. But the word "anti" means against, so anyone who works against Christ, and uses deceit and seduction is an antichrist.
It's actually based on the life, words, and deeds of the Man, Jesus of Nazareth. The Jewish Bible just happens to have predicted and promised His coming. But where's the delusion? The eyewitnesses to Jesus's ministry? The early church which was taught by those eyewitnesses? The modern church that believes the written accounts of Jesus and the expositions of His earliest followers? Which part of Christianity is a delusion, and when did that delusion come into play?
Can you tell me how you plan to go about healing people, turning water into wine, walking on water, feeding 5,000 with a basket of loaves and fishes, and rising from the dead? When you answer this, then I'll tell you how I would address those events without supernatural beliefs.