One of the prophecies about the man of sin was written by a prophet named Daniel.
He warned: "He shall regard neither the God of his fathers nor the desire of women, nor regard any god; for he shall magnify himself about them all", Daniel 11:37.
This vision has puzzled many people but it would seem to prove that the antichrist will be a Jew since it states that he won't have regard for "the God of his Fathers." That quote is only used in the Bible concerning Jews. It also points out that he will have no regard or desire of women."
If he was pagan, God would not point out his rejection of his fathers.