You, my friend, are ill-informed. The idea of the antichrist has deep and complex origins that developed over centuries, blending Jewish apocalyptic expectations, early Christian theology, and later medieval interpretation.
John 2:18 — “Children, it is the last hour; and as you have heard that Antichrist is coming, so now many antichrists have come.”
1 John 4:3 — “This is the spirit of the Antichrist, which you heard was coming and now is in the world already.”