It is evident also that the “Man of Sin” closely resembles the “Beast” of Revelation:

2Th 2 Rev 13; 17
2Th 2:3. The falling away must come first. Rev 17:13,11. A harlot will be seated on the Beast, who goes into perdition.
2Th 2:4. He exalts himself against God. Rev 13:4,5,8,12. The world worships the Beast, who speaks blasphemies. All the dwell on the earth except the faithful shall worship it. The false prophet ensures this.
2Th 2:4. He sits in the temple of God, claiming to be God. Rev 13:6. It blasphemes God’s name, His tabernacle, and those who dwell in heaven.
2Th 2:7. The mystery of iniquity is already at work. Rev 17:5. The harlot is called mystery, the mother of the abominations of the earth.
2Th 2:8. The Lord Jesus shall destroy him with the breath of His mouth, and bring him to naught by the manifestation of His coming. Rev 17:14; 19:15. The Lamb shall overcome the Beast with the ten kings. Out of his mouth proceeds a sharp sword.
2Th 2:9. His coming is according to the working of Satan, with all powers and signs and lying wonders. Rev 13:13. He doeth great signs, that he should even make fire come down from heaven: it was given to him to give breath to the image of the Beast, that it should speak.
2Th 2:10. With all deceit and unrighteousness in them that are perishing, because they received not the love of the truth that they might be saved. For this cause God sends them a working of error, that they should believe a lie. Rev 13:14. He deceives them that dwell on the earth by reason of the signs.

This comparison leaves little doubt that the Man of Sin and the Beast refer to the same power.