No, 2Thessalonians2:3-4 is not teaching the church would go through the great tribulation. But just the opposite.God's words clearly teach the (Man Of Sin/ The Antichrist) will be revealed to the church upon earth, you falsely believe and teach the church won't be on this earth
2 Thessalonians 2:3KJV
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;
Paul was reassuring the believers in Thessalonica that the church, the body of believers in Christ, will be raptured from the earth before the Antichrist reveals himself to be the man of sin.
The Antichrist, when he commits the transgression of desolation act described in 2Thessalonians2:4, revealing himself as the man of sin, will trigger the beginning of the day of the Lord when God's wrath will be poured out.
In 1Thessalonians5:1-11, Paul taught that believers in Christ will be resurrected/raptured before the day of the Lord begins. The resurrection/rapture is in 1Thessalonians5:9-11.