He will oppose and exalt himself above every so-called god or object of worship. So he will seat himself in the temple of God, proclaiming himself to be God.
Textus Receptus (TR) - 2 Thessalonians 2:4 >ὁ ἀντικείμενος καὶ ὑπεραιρόμενος ἐπὶ πάντα λεγόμενον θεὸν ἢ σέβασμα, ὥστε αὐτὸν εἰς τὸν ναὸν τοῦ Θεοῦ ὡς Θεὸν καθίσαι, ἀποδεικνύντα ἑαυτὸν ὅτι ἐστὶ Θεός.