Paul in those verses was comforting the Thessalonians, who were thinking that the day of the Lord (Christ) had begun and that they had missed the rapture. See verse 2 in red above.2 Thess 2:1 Now we beseech you, brethren, by the coming of our Lord Jesus Christ, and by our gathering together unto him, 2 That ye be not soon shaken in mind, or be troubled, neither by spirit, nor by word, nor by letter as from us, as that the day of Christ is at hand. 3 Let no man deceive you by any means: for that day shall not come, except there come a falling away first, and that man of sin be revealed, the son of perdition; 4 Who opposeth and exalteth himself above all that is called God, or that is worshipped; so that he as God sitteth in the temple of God, shewing himself that he is God.
Paul indicated that the biggest signs of Christ's coming when the rapture occurs is that there will be a mass falling away from the faith and the man of sin would be revealed first before that.
Paul explained to them the day of the Lord would not begin until...
1. the falling away (from believing Jesus is the messiah) happens first.
2. and the man of sin revealed by his going into the temple, sitting, claiming to have achieved God-hood (the transgression of desolation act)
In 1Thessalonians5:9-10, the rapture is before the day of the Lord begins.
On my anytime rapture view chart, I added the notation in red. The falling away will be because some Christians will think that the Jews were right all along, and the person anointed the King of Israel following the Gog/Magog event is the real messiah instead. Which that person will initiate what will be a false messianic age, with the world saying "peace and safety.
I hope this clears it up for you. (please note I have not called anyone here liars or other demeaning accusations, simply because there is some disagreement over the timing of the rapture and some differing understanding of what the text of bible means in certain passages)

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