2 Thessalonians 1:9  “Who shall be punished with everlasting destruction…”

2 Thessalonians 2:1  “…the coming of our Lord Jesus Christ, and…our gathering together unto him”
Chapter 4 of his previous letter.  He probably got word of questions from the last letter.

2 Thessalonians 2:3  “…that day shall not come, except there come a falling away first, and that man of sin be revealed, the son of perdition”
2 Thessalonians 2:4  “…he as God sitteth in the temple of God, shewing himself that he is God.”
Following verses expand on this person.  This seems to say that the Rapture would not occur until there is a great falling away in the church and the one to be the Antichrist is revealed.  It doesn’t say that he is given any power or control, only that he is revealed.  Per Revelation 6, the first seal reveals the rider on the white horse who is given a crown.  He has a bow and is able to conquer.  Putting the two together, you have the man revealed to the world in some fashion, perhaps as a well-liked man of peace or a man of some great influence, and then after the Rapture, he is given a position of power and is able to begin conquering the world.  Eventually, he will put himself above God to the point of sitting in the temple and declaring himself to be God.

2 Thessalonians 2:7  “…he who now letteth will let, until he be taken out of the way.”
The Holy Spirit within the believers restrains the full manifestation of the Antichrist.  However, as the great apostasy grows, the power of restraint becomes less.  Finally, when the family of God is gathered to Him, the restraint will be gone and the way will be clear for the evil of the Antichrist to be fully manifested.

2 Thessalonians 2:8  “…whom the Lord shall consume…”
Regardless of the apparent power of the Antichrist, he will still be destroyed by Jesus at His return.  There is never any doubt of the total and absolute power and authority of Christ.  The only reason the Antichrist appears to have any power is because of Christ’s physical absence.  Any weakling may appear strong if there is no one to oppose him.

2 Thessalonians 2:11  “…God shall send them strong delusion, that they should believe a lie”
As Christ said, even what they had will be taken away.

2 Thessalonians 3:3  “…the Lord is faithful, who shall stablish you, and keep you from evil.”

I hope you enjoy reading and studying His word.  May it accomplish what He desires.  Please feel free to comment or post questions.  Thanks for reading!