The NKJV of the text refers to “the Antichrist.” You will note the definite article, and the capital to the word, making it a name rather than a description. Both are highly suspect. First, it is generally understood that a definite article (the) is not in the text. Second, the word antichrist as used here does not have reference to a particular individual, but anyone who is opposed to the Messiah.
In effect, “You heard that opposition and error is coming, it is already here, as there are many teaching error and opposed to the Messiah at this time.”
John shows the division between those who accept the truth regarding the Father and His Son, and those who advocated for a very different concept was present. It was obvious. The departure from the faith indicated that they had left the truth, and were no longer to be considered faithful. It had become obvious that the unity God expected of His was no longer respected by some.
