(All quotations are from the NASB Bible.)
There are only a few verses in the Bible about the Antichrist. 1 John 2:18 says many antichrists have come, so there is not just one Antichrist. The verse also associates the Antichrist with the last days.
1 John 2:22 says the Antichrist is a liar who denies Jesus is Christ. Christ means anointed, and Jesus was anointed prophet, priest, and king. A king has a throne, dominion, laws, rulers, and a capital city, not to mention subjects. Most people deny Jesus will be a real ruler of a real nation, and in doing this they are Antichrist.
Not only will Jesus rule a real nation, he will be king of the Jews. An angel told Mary, “He will be great, and will be called the ‘Son of the Most High’, and the Lord God will give him the throne of his father David, and He will reign over the house of Jacob forever, and His kingdom will have no end.” (Luke 1:32-33) Jesus agreed with this, telling His Apostles, “..when the Son of Man will sit on His glorious throne, you also shall sit upon twelve thrones, judging the twelve tribes of Israel.” (Matthew 19:29) The most popular view of the Antichrist is that he will set himself up as king of Israel. Thus we see that many people who claim to be Christian will mistake Jesus for the Antichrist.
The belief that the Antichrist comes to reign in Israel comes in part from confusing the Beast and the Antichrist. However, no scripture says the Beast and the Antichrist are the same. In fact, the word Antichrist does not appear In Revelation at all. Some Bible footnotes confuse the Beast with the Antichrist, but these footnotes are not of divine inspiritation, they are merely the opinion of man.
1 John 2:22 also says the Antichrist denies the Father and the Son. Some people say God is a trinity, while others say He is a unity only. Those who are wrong are Antichrist.
“For many deceivers have gone out into the world, those who do not acknowledge Jesus Christ as coming in the flesh. This is the deceiver and the antichrist.” (2 John 7) Jesus means Savior, but whom does He save? Did He save Himself also? Christ means anointed, but why was Jesus anointed?
The saying that Jesus was come in the flesh means He was temped with sin. Not all Christians believe this, and they are hence antichrists. 1 John 4:3 makes similar points saying,”…every spirit that does not confess Jesus is not from God; and this is the spirit of the antichrist, of which you have heard that it is coming, and now is already in the world.”
It is obvious from reading the pages of the Bible that it is crucial to be sound in doctrine. Salvation depends on an understanding of God’s nature. (John 17:3) Those who do not understand this are antichrists. Also, an improper understanding of the Antichrist will lead many to reject Jesus when he returns.