The Antichrist is an interesting figure. It or he is referred in the New Testament of the Bible, but not in the Old Testament. This shouldn't be surprising as there is no Christ in the Old Testament, though over the years those books of the Bible have been searched for references to Jesus which were duly found, but were less than clear and required inventive explanation. The same may be said of the Antichrist.
The Antichrist is also mentioned by Paul of Tarsus and several of the Church Fathers, who found it necessary or useful to describe it or him in more detail than appears in the Bible. I don't know if the Antichrist is referred to in the many gospels which were excluded from the Bible, some of which refer to Jesus using his divine powers to kill those who annoy him and decribe him as quite different from the Jesus we know through those authors known as Matthew, Mark, Luke and John.
As only makes sense, the Antichrist denies Christ, and works to induce others to do so as well. It's unclear whether the Antichrist is to be a single individual or if there's to be more than one. Many have been called the Antichrist over the centuries. Nero was one of those named. So we're various Popes or the very office of the Papacy (by Protestants). Mohammed was called the Antichrist, and so were some heretics like Arian.
Some have claimed the Antichrist is among those false prophets and wonder-workers we were warned of in Scripture. There were quite a few of those wandering around the Mediterranean while Jesus is claimed to have lived, like Simon Magus and Appollonius of Tyana. Appollonius' story is similar to that of Jesus in many respects--each performed the same kind of miracles, for example, like raising the dead.
The Antichrist is described as having various characteristics, some of which have a certain, or in some cases uncertain, basis in Scripture. Others have been added over time. Among other things the Antichrist is charismatic, a deceiver, considers himself divine, is worshipped as a god, controls the economy, and rules the world from Jerusalem of all places. Various figures have been thought to to qualify over the centuries given this description; some are considered the Antichrist even now (I need not name them). But after a relatively short period of time the Antichrist is destroyed by Jesus.
Among the problems I have with the Antichrist is the fact that his death and defeat is inevitable according to all sources. It may be that the Antichrist's followers would be stupid or ignorant enough to disregard the many prophecies of their leader's ruin, but presumably, the Antichrist would be aware of these sources, and know his fate. Who or what would want to be the Antichrist given the destruction which awaits?
Difficulties arise when we believe that accounts which were intended to address contemporary or imminent events apply thousands of years later. So the end times, preceding the Second Coming of Jesus, which he himself said would take place in the lifetimes of his disciples according to the Gospel of Matthew, are still awaited by the credulous, although believers predicted they would take place many times already and have been disappointed as many times in the past.
So it should be no great surprise that we're so gullible, so easily misled, so completely bovine when those who wish to take advantage of us do so in these New Dark Ages. We've been dupes for millenia.