The church started in Jesus' day and there is no church mentioned after the tribulation begins.
Two churches are mentioned in Rev 11 which is near the end of the trib so they are very much in the trib, along with members of the Church such as the two prophets and all those who are killed for their testimony of Jesus.
Rev 11:3 And I will give power unto my two witnesses, and they shall prophesy a thousand two hundred and threescore days, clothed in sackcloth.
Rev 11:4 These are the two olive trees, and
the two candlesticks standing before the God of the earth.
Candlesticks are churches:
Rev 1:20 The mystery of the seven stars which thou sawest in my right hand, and the seven golden candlesticks. The seven stars are the angels of the seven churches: and
the seven candlesticks which thou sawest are the seven churches.
These two churches are part of the two witnesses. That makes them part of the overall church of Christ and they are very much living through the Great Tribulation on the Earth.
Rev 11:3 And I will give power unto my two witnesses, and they shall prophesy a thousand two hundred and threescore days, clothed in sackcloth.
Rev 11:4 These are
the two olive trees, and the two candlesticks standing before the God of the earth.
Rev 11:10 And they that dwell upon the earth shall rejoice over them, and make merry, and shall send gifts one to another; because these
two prophets tormented them that dwelt on the earth.
The other part of the two witnesses are two olive trees which are also called two prophets. These are Christians who are part of the overall church of Christ and they are very much living through the Great Tribulation on the Earth.
Rev 7:3 Saying, Hurt not the earth, neither the sea, nor the trees, till we have sealed
the servants of our God in their foreheads.
Rev 7:4 And I heard the number of them which were sealed: and there were sealed
an hundred and forty and four thousand of all the tribes of the children of Israel.
These are also Christians which are a part of the overall church of Christ and they are very much living through the Great Tribulation on the Earth. They are also sealed before the Great Tribulation begins which means they are not converts during the Great Tribulation which Pre-trib errantly calls "tribulation saints".
Not one scripture ever says anyone converts to Christ during the Great Tribulation. How could they? You are either marked by the Antichrist and belong to him or you reject the mark and belong to God.
Is Pre-trib correct that the church is not mentioned in the middle chapters of Revelation? No, Pre-trib is wrong.
Is Pre-trib correct that the church is removed before the Great Tribulation begins? No, Pre-trib is wrong.