We have the full gospel according to Saint John. He teaches nothing about a single antichrist coming. John is straightening out false doctrine that has reached the ears of His little children.
Truman was a first baptist minister (false Prophet) who made fire come down out of heaven in the sight of men.
The type have setup their false versions of Christ in the temple of the body showing themselves that they are god in their understanding since long before you were born.
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That's exactly how the workers of iniquity work, they don't understand God's Word, so they always misapply Scripture to some worldy carnal notion outside the parameters of God's Word, and then push among the Churches. It is impossible to apply the false working of the one Paul warned of in 2 Thess.2:3-4, and Jesus in Matt.24:23-26, to ANY flesh born man of the past, or of the future.