Let's look at this again and consider it might be talking about something that already happened:
2 Thessalonians 2
2Th 2:1
Now we beseech you, brethren, by the coming of our Lord Jesus Christ, and by our gathering together unto him,
//The Kingdom of The Body of CHRIST.
2Th 2:2
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.
//"at hand" means then.
2Th 2:3
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;
//seed of satan with The HOLY SPIRIT stepping back to allow it
2Th 2:4
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.
//70 A.D. The Temple was destroyed.
135 A.D. fall of the whole City, with a false temple with idol built over The Jewish Temple (to jupiter)
equestrian statue of hadrian was installed over the Holy of Holies.
2Th 2:5
Remember ye not, that, when I was yet with you, I told you these things?
//Why do we think this is talking to us? It sure sounds like he is warning them about an event in their generation.
2Th 2:6
And now ye know what withholdeth that he might be revealed in his time.
2Th 2:7
For the mystery of iniquity doth already work: only he who now letteth will let, until he be taken out of the way.
2Th 2:8
And then shall that Wicked be revealed, whom the Lord shall consume with the spirit of his mouth, and shall destroy with the brightness of his coming:
// JESUS destroyed the son of perdition with The LIGHT of His Coming, not The Return.
2Th 2:9
Even him, whose coming is after the working of Satan with all power and signs and lying wonders,
2Th 2:10
And with all deceivableness of unrighteousness in them that perish; because they received not the love of the truth, that they might be saved.
2Th 2:11
And for this cause God shall send them strong delusion, that they should believe a lie:
//People are under a delusion today ...not after His Return.