You probably won't listen, so this is likely for those brethren in Christ that will listen.
Apostle John in 1 John 2:18 revealed that a singular "antichrist" shall come, which they had already heard about, and yet there also were "many antichrists" already at work. Apostle Paul gave that same warning in 2 Thessalonians 2, and so did Lord Jesus below...
The 'many antichrists' idea:
Matt 24:5
5 For many shall come in My name, saying, I am Christ; and shall deceive many.
KJV
The singular coming antichrist idea:
Matt 24:23-26
23 Then if any man shall say unto you, "Lo, here is Christ, or there"; believe it not.
24 For there shall arise false Christs, and false prophets, and shall shew great signs and wonders; insomuch that, if it were possible, they shall deceive the very elect.
25 Behold, I have told you before.
26 Wherefore if they shall say unto you, "Behold, He is in the desert"; go not forth: behold, "He is in the secret chambers"; believe it not.
KJV
In those parts in red, Jesus is pointing to a singular false Christ.
Even the Greek for "false Christs" in verse 24 is simply the sole Greek word 'pseudochristos', made up of 2 Greek words, pseudo meaning false, and Christos which is singular for Christ (see Strong's nos.5571 and 5548).
The reason these Matthew 24:23-26 verses are about a 'singular' antichrist those in 1 John 2:18 had already heard shall come, is because this one is to work those great signs and wonders that IF possible, would deceive even Christ's very elect. The working of those 'great signs and wonders' is the key, and links directly to 2 Thessalonians 2 about the false one there, and to Revelation 13:11 about the "another beast" that is to do that same working of miracles to deceive.
In 2 Thessalonians 2:3-4, Apostle Paul warns of a "man of sin" that is to come, sitting in the temple of God (a new temple for the end in Jerusalem), proclaiming himself as God, and over all the is called God, or that is worshiped. That's John's singular "antichrist" idea. And then in 2 Thessalonians 2:7 Paul reveals that the "mystery of iniquity" is already at work, which is John's idea about the "many antichrists" already at work. And at 2 Thessalonians 2:9 verse tells us that false one is coming after the working of Satan, with all power and signs and lying wonders. So that's a direct connection to the Matthew 24:24 working of "great signs and wonders".
Thusly, the Matthew 24:5, Matthew 24:23-26, 2 Thessalonians 2:3, 2:7, 2:9, and Revelation 13:11-14, and 1 John 2:18 Scriptures are all about the same subject of a singular antichrist, and the many antichrists (his followers).
We've already had many in history that claimed to be Christ, but NONE of them had the power of those great signs and wonders. The Antichrist to come at the end of this world will have that power, as those Scripture examples attest.