Actually, you are right on this point. John wrote that many antichrists would come out from among them, making it obvious that none of them really belonged among those to whom he was writing to.
"Little children, it is the last hour: and as ye have heard that The Antichrist shall come, even now are there many antichrists; whereby we know that it is the last hour. 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." (1 John 2:18-19).
The error you are making is presuming that this development needed many centuries to grow. John said that The Antichrist (ho antichristos)`was a present reality among the many antichrists that were already apparent at that "last hour". They were not "unrecognizable" as you suppose, because John said these many antichrists had already made their identity manifestly obvious to all by their not remaining among them.
John had apparently read Paul's previous letter to the Thessalonians about the Man of Lawlessness, which told the saints that the gathering of the resurrected believers at Christ's coming would not take place until just after this Man of Lawlessness (The Antichrist) had come and gone. John was reminding the believers of Paul's words on this matter, and telling them that the "last hour" before Christ's return had already arrived by then, as proved by the many antichrists that had already been manifested among them.
The presence of the many antichrists to which John referred did not preclude the emergence of an antichrist of the unique characteristics which Paul described. Thus, an antichrist who did not appear and then depart from the Church such as those described by John, but one who remained within the Church, took up permanent residence therein, and slowly but inexorably usurped and arrogated complete and intractable spiritual authority and control over centuries of apostasization.
Not a singular antichrist of all time (the Reformers were well aware of John's descriptions), but one who necessitated a spiritual battle of vast scope, which by God's grace and mercy was ultimately won.
The Reformation.
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