Shalom, veteran.
I well recognize that John gave the definition of what 'an' "antichrist" is per the 1 John 2:22 and 2 John 1:7. But 'who' is the father of that idea of refusing Christ? Satan, the devil himself, for that's exactly what his sin from the beginning was about, denying the Father and His Son and instead trying to place himself in Their Place. Thus John also defined that idea with "the spirit of antichrist", which one cannot just say that "spirit of antichrist" originates from some flesh man. Because Satan's original sin was about his denial of The Father and The Son in wanting himself to be The GOD, we cannot separate that idea from the meaning of the word "antichrist" either; especially since in the Greek the word 'anti' also is used in the substitution for something else sense.
Perhaps, but the real problem is how prevalent the rejection of the concept of Yeshua` being the Messiah is, especially among those who call themselves "Christians!" Oh, they call Him "Christ," but most think it's just His last name! How awful for them to be so
blind! Can you understand what it means for Yeshua` to be
haMashiach Elohiym, the Messiah of God? He is the Anointed to be King! He is the King Apparent! They just don't get it! They think "Christ" means the "Savior of men." Some believe it confirms that He is the Son of God. Some feel that it means He IS God.
However, it is important that we understand that there was more than one "christ" in history. Since, "christ" = "messiah" = "anointed one," then all who were anointed in the OT were also messiahs or christs. The list of men who were so anointed include Aaron, Aaron's sons, and all who have been high priests. Several prophets were so anointed, such as Elijah, Elisha, and Ezekiel. Also, kings were so anointed, both of Judah and of Isra'el as well as foreign kings. Saul, David, and Solomon were all so anointed. ALL of these men were "christs" or "messiahs" because ALL of them were "anointed."
There are several prophecies that promise that there will come a Great One who will be the FINAL King because His reign will last forever, and it is THIS set of prophecies that Yeshua` (Jesus) fulfilled and will continue to fulfill when He returns.
Therefore, EVERY ONE of the "Christians" who believe that the "Church" replaced Isra'el in some way denies that Yeshua` will become the King of Isra'el as was promised to Isra'el. Thus, these "Christians" are "antichrists," by definition.