True~but, more could be added to prove one is an antichrist~
True.
1Jo 2:22Who is a liar but he that denieth that Jesus is the Christ? He is antichrist, that denieth the Father and the Son.
The question is asked as a final proof of an antichrist, not the only proof. It's the point where there can be no doubting who is an antichrist. It's only the final straw of previous errors and deceits.
2Jo 1:7For many deceivers are entered into the world, who confess not that Jesus Christ is come in the flesh. This is a deceiver and an antichrist.
It's the same final straw of knowing who is not saved in CHrist Jesus, by being a murderer. (I john 3:15)
Scripture is not saying denial of Jesus Christ coming in the flesh, or that being a murderer, is the only way of knowing who is an antichrist, and who is not justified with God.
An antichrist is simply anyone declaring to believe in Jesus as the Christ, and yet departs from the Jesus Christ made known to the world by the apostles of Christ.
1Jo 2:18Little children, it is the last time: and as ye have heard that antichrist shall come, even now are there many antichrists; whereby we know that it is the last time. They went out from us, but they were not of us; for if they had been of us, they would no doubt have continued with us: but they went out, that they might be made manifest that they were not all of us.
Gen 4:16And Cain went out from the presence of the LORD, and dwelt in the land of Nod, on the east of Eden.
We see here that Cain was an antichrist and a murderer. First he departed from the LORD's sacrifice by putting forth his own manner of one, and then preached it to Abel. He then killed righteous Abel for not perverting the LORD's sacrifice with him. When antichrists go out from the doctrine of Christ, they go out from the presence of the Lord and the fellowship of the saints. But unlike simple apostates, they then turn against the Lord Jesus and His people, by preaching their own doctrine and christ in the name of Jesus.
Gal 1:8But though we, or an angel from heaven, preach any other gospel unto you than that which we have preached unto you, let him be accursed. As we said before, so say I now again, If any man preach any other gospel unto you than that ye have received, let him be accursed.
Antichrists separate themselves from the gospel of Jesus Christ according to the Scriptures, to preach another gospel of their own, and make themselves false apostles of another christ, to deceive believers from the true Christ and God Jesus:
2 Cor 11:13For such are false apostles, deceitful workers, transforming themselves into the apostles of Christ.
Mark 13:22For false Christs and false prophets shall rise, and shall shew signs and wonders, to seduce, if it were possible, even the elect.
We see here that antichrists are decievers as the serpent. They begin with subtle errors, that lead to the last great lie that surely identify themselves as antichrists. No antichrist just comes out at the first to declare themselves against the only Christ of Scripture, Jesus Christ.
Eleanor said:
Was not the man, Jesus of Nazareth, the Christ, created (Lk 1:30-35)?
As we see here, like the serpent asking a seemingly innocent question about what God said, they begin with asking if Scripture doesn't say Christ was created, since He was born of a woman.
Jude 1:4
False prophets of the latter days just before Jesus' coming again, will deny much of the word of God while claiming to be great defenders of the truth, when in truth, are just as guilty as some of the most obvious false cults.
The real question is why.
And also, it's important to understand that believers becoming false apostles and teachers and christs, do not necessarily seek to become one. No believer wakes up one day and tells themselves they want to become a cult leader of their own. The begin as sincerely in love with the Lord Jesus as others, but somewhere along the line, they get off track like Judas, who began just as much a disicple chosen to be an apostle as the other 11. And He didn't betray the Lord just for the money, but had another plan in mind. When he saw things didn't go according to plan, he threw the money down and hanged himself for his failure.
The greatest decievers of others are first decieving themselves. However, at some point, I believe the Lord does let them personally know they are crossing a line and are at the final straw with the Lord, else they too will depart from His presence forever, even as Cain the first antichrist and murderer on earth.
Rev 2:20Notwithstanding I have a few things against thee, because thou sufferest that woman Jezebel, which calleth herself a prophetess, to teach and to seduce my servants to commit fornication, and to eat things sacrificed unto idols.
And I gave her space to repent of her fornication; and she repented not. Behold, I will cast her into a bed, and them that commit adultery with her into great tribulation, except they repent of their deeds.