"Who is a liar but he that denieth that Jesus is the Christ? He is Antichrist, that denieth the Father and the Son" (1 John 2:22). This name introduces to us one of the most solemn and foreboding subjects in the Word of God. It brings before us one of the persons in the Trinity of Evil. At every point he is the antithesis of Christ. The word "Antichrist" has a double significance. Its primary meaning is one who is opposed to Christ; but its secondary meaning is one who is instead of Christ. Let not this be thought strange, for it accords with the two stages in his career. At first he will pose as the true Christ, masquerading in the livery of religion. But, later, he will throw off his disguise, stand forth in his true character, and set himself up as one who is against God and His Christ.
Not only does anti-christ denote the antagonist of Christ, but it tells of one who is instead of Christ. The word signifies another Christ, a pro-Christ, an alter christus, a pretender to the name of Christ. He will seem to be and will set himself up as the true Christ. He will be the Devil's counterfeit. Just as the Devil is an Anti-theos -- not only the adversary of God, but the usurper of the place and prerogatives of God, demanding worship; so the Son of Perdition will be anti-christ -- not only the antagonist and opponent of Christ, but His reval: assuming the very position and prerogatives of Christ; passing himself off as the rightful claimant to all the rights and honors of the Son of God.