Actually anyone who denies Jesus is making themself an antichrist
People who deny their own personal sin and need for a personal savior have made themselves their own savior and are their own Christ and have become their own "instead of" (Anti)Christ.
Anti means instead of, the instead of Christ. It is like asking for water and instead getting poison. The poison may look and smell like water but it is not water and will not refresh and sustain life. It will, instead, poison and take life. The antichrist is the same way; he is "instead" of Jesus. Jesus is the real Savior that is why He became a man to save us from our sins. We are already saved completely; we have no further need for another savior. The one we have, Jesus, is sufficient. The coming one is not a savior he is a deceiver, a counterfeit, a phony, a liar and all who follow his poisonous lies will be led into death with him who opposes the real and living God.
1 John 2:18 Little children, it is the last time: and as ye have heard that Antichrist shall come, even now are there many antichrists (self saviors); whereby we know that it is the last time.
Source Basic Christian: Theology