The church was not removed from the earth - Christ came to dwell with the church.
1 Th 4:15 For this we say unto you by the word of the Lord, that we which are alive and remain unto the coming (Greek– parousia) of the Lord shall not prevent them which are asleep.
1 Th 4:17 Then we which are alive and remain shall be caught up together with them in the clouds, to meet (Greek- apantesis) the Lord in the air: and so shall we ever be with the Lord.
The Greek parousia and apantesis would have specific meanings to the people of 1st century AD.
Greek definitions (not all)
parousia - presence, of persons; arrival; esp. Visit of a royal or official personage
apantesis - to move from a place to meet a person; then, generally, to meet, encounter
Paul's usage of the words do not suggest a removal of Christians from earth, but rather Christ is visiting them to dwell with them.
Parousia and apantesis when used together are being used in a “technical” sense, the words in the ancient world would be used (and understood) to describe a visit by a king or a royal dignitary when making a visit to a town or a city.
The people being in wait for the dignitary would watch for his coming, they would then go out to “meet” (apantesis) him.They would then escort him back to the city. The city is the destination. He was not coming to remove them from the city.
We can see how “apantesis”, meet is used in the following verses:
Mat 25:1 Then shall the kingdom of heaven be likened unto ten virgins, which took their lamps, and went forth to meet (Greek– apantesis) the bridegroom.
Mat 25:6 And at midnight there was a cry made, Behold, the bride groom cometh; go ye out to meet (Greek- apantesis) him.
Acts 28:15 And from thence, when the brethren heard of us, they came to meet (Greek– apantesis) us as far as Appii forum, and the three taverns: whom when Paul saw, he thanked God, and took courage.
Paul is telling the Thessalonian's they will meet him in the air in a spiritual event – his coming in the clouds – just as Paul was caught up to the third heaven.