There's a lot wrong with this perspective. To begin with there is no Pretribulational Rapture in the Bible. Period. Paul taught in 2 Thes 2 that it is a deception to believe that Christ can come back with his Kingdom before Antichrist appears. Paul teaches that Christ comes back with the express purpose of destroying Antichrist, and will not come back earlier than that.
2ndly, the overcoming of the Church you make sound like a failure on the part of Christianity because they did not "make the Pretrib Rapture." The opposite is taught in the book of Revelation and in Dan 7. The victory of the Beast over the saints is very short-lived, and simply means God allows, for a short time, the Antichrist to persecute the Church. It does not mean the Church is failing at that time!
The truth is, you have just not found the pretrib rapture. It is there and millions have found it. Need help?
Paul told us the rapture would come just before wrath.
John teaches us that wrath begins at the 6th seal.
The 5th seal is for the martyrs of the church age. They are told that judgment will not begin until the final martyr killed as they were killed - as church-age martyrs.
What will cause a certain martyr to be the FINAL church age martyr? That would be when the church age ENDS. It will end at the pretrib rapture.
Therefore, the church has been waiting at the 5th seal for that final church age martyr. One day soon Jesus will come, call up the dead in Christ, then call up those who are alive and in Christ, the church age will END and the Day of the Lord will begin. Judgment will begin. The 6th seal will be opened to begin the Day of the Lord.
As further proof, John saw the just-raptured church in heaven right after the 6th seal. That is the crowd, too large to number. Perhaps 50 generations of believers all caught up at once: billions of believers.
Then, a few days (perhaps the ten days of awe) later, and Jesus will open the 7th seal to begin the 70th week of Daniel. Since 6 always comes before 7 in counting, the rapture will most certainly be pretrib.
Second, it will not be "the church" there in the days of GT - it will be only a remnant left as Rev. 12 tells us. This is yet another proof of the pretrib rapture - only a remnant of believers left on earth.
Classic pretrib theory has been wrong all these years (as has almost all other end time theories) imagining the 70th week (or Trib') would begin with the first seal. That theory is a myth. Revelation 4 and 5 show us that Jesus got the book and began opening the seals as soon as he ascended into heaven and sent the Holy Spirit down.
Finally, Paul would not write of a pre-wrath rapture in one letter, then change his mind in his second letter. Most people read the 2 Thes. 2 passage wrong. What Paul wrote is that the departing (of the church as in the rapture) must come first, as the restrainer is "taken out of the way," and then the man of sin will be revealed. When someone sees the man of sin revealed, then will then know that the Day has begun and they are then inside the Day of the Lord.
There are two keys to understanding Paul's intent" first, notice that in verse 3b the man if sin is revealed. How did he get revealed? According to verses 6-8, he could not be revealed unless the power restraining him had departed or was gone or was taken out of the way.
Therefore, somewhere in verse 3a, the restraining force is taken out of the way.
The second key is when Paul wrote, concerning this restraining force, in verse six, "and NOW YOU KNOW who is restraining..." Why did Paul write those words? Simple: He just told the readers, but did it in a veiled way. The restraining force removed is hidden in the word apostasia.