Pretty sure Jesus said that the only thing that will not be forgiven is blasphemy against the Holy Spirit and it is not established that the mark is such a blasphemy. Further I would argue that the behaviors of encouraging or mandating the vaccine and ignoring it's harm is fitting with the esoteric interpretation of forehead and hand being your thoughts and actions and the mark of the beast is accepting the dynamic the vaccine is creating rather than the vaccine itself.
A third angel followed them and said in a loud voice: “If anyone worships the beast and its image and receives its mark on their forehead or on their hand, they, too, will drink the wine of God’s fury, which has been poured full strength into the cup of his wrath. They will be tormented with burning sulfur in the presence of the holy angels and of the Lamb. And the smoke of their torment will rise for ever and ever. There will be no rest day or night for those who worship the beast and its image, or for anyone who receives the mark of its name.”
Revelation 14:9ff
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