Paul in his second letter addressed the confusion that his first letter had caused. The subject is our gathering back to him. That happens only once and it will "not happen" until the falling away (apostasy) and the man of sin be revealed.
The original subject of chapter 4 is where the dead are. He then goes on to explain what will happen at the day of the Lord and states that they comfort themselves about the dead loved ones. It wasn't comfort about a pretrib rapture. The bible has to be read in context. We can't just pull out a few verses and create something out of it. Christ states he comes back immediately after the tribulation of those days. We have to take him for his word. The disciples as for signs of his coming, not comings.
Where does it state he's only coming to the air? That is false. It does not state that. For one, the word air does not mean sky in that verse and two it does not state he's "only" coming to the air. We are meeting the Lord. It does not state at all that we rise into the sky or any elevation for that matter. That's a different word for "air" altogether.
Paul also used clouds when talking about people.
But the biggest thing is air does not mean sky in that verse. Plus we cannot leave out this verse -
I Thessalonians 4:14 "For if we believe that Jesus died and rose again, even so them also which sleep in Jesus will God bring with him."
Those are the saints that Christ brings with him and the saints of Rev 19.
And the word "remain" also means, those left all around/ survive in the Greek. There are many different Greek words for the word remain and only one Greek word means this in this instant of the word utilized only in verses 15 and 17. It's a good study as well.
And if we read further into chapter 5 we see that Paul calls this very event the day of the Lord. So there should not be any confusion to what event we are talking about.
"Paul in his second letter addressed the confusion that his first letter had caused. " You are already off on a tangent. His first letter was "God breathed" just as his second letter was. They were troubled because they had been told by someone or some thing that they were IN the Day of the Lord—that the Day had started and they were in it. Paul's first letter told them the catching up would come before the Day. It is very easy to understand why they were troubled. They probably thought they had missed the rapture. It seems they wrote to Paul and asked him to clarify when the Day of the Lord would come in relation to the catching up of the church.
I think you and many others have missed Paul's intent on any kind of a falling away. It is a very significant "departing" that Paul expected his readers to know and understand. Which significant departing? Just look back at Paul's theme: the catching up of the church. The church will be caught up and "depart" the earth to the sky where we find air and clouds. A "falling away" is a myth: when one person "falls away" (from what Paul did not say) two more are born again. The church world wide is growing, not shrinking. According to Paul's first letter, the gathering will come just before the start of the Day of the Lord and just before God's wrath begins. In Revelation that is at the 6th seal.
What was in Paul's mind when he wrote of us comforting one another?
9 For God hath not appointed us to wrath, but to obtain salvation by our Lord Jesus Christ,
10 Who died for us, that, whether we wake or sleep, we should live together with him.
11 Wherefore comfort yourselves together, and edify one another, even as also ye do.
We are to comfort one another about the fact that God will set no appointments for us with His wrath, because we will be caught up just before wrath? Is that not a great comfort? He sets appointments for the sinner.
"Christ states he comes back immediately after the tribulation of those days. We have to take him for his word. "
OF COURSE, He is coming back after the tribulation: Jesus own words and it is confirmed in Revelation 19. However, neither of these passages PREVENT His coming pre-trib for His church, which is what Paul teaches. The bible has to be read and understood in context. The truth is, the Gentile church of today was only a MYSTERY hidden in the Father when Jesus spoke of the end times. He was speaking of the end of the JEWISH age, proven by His mention of the abomination that will divide the 70th week of Daniel. How could He speak of the future Gentile church when it was still a mystery? At that time Jesus knew nothing about Paul being sent to the Gentiles.
"The disciples as for signs of his coming" Of course! The only coming they knew of was His coming to Armageddon.
"Air?" Not the air we see when we look up? Not the air planes fly through? I have one question: Which air contains or holds the clouds we see when we look up? That is the air in which we are going to meet Jesus. I will agree that Paul did not tell write of our destination after we are caught up into the air. However, John 14 provides our destination after we are caught up. Remember, we will be caught up just before the start of God's wrath, which in Revelation begins at the 6th seal. In Revelation the "tribulation" or 70th week does not begin until the 7th seal. Since 6 always comes before 7 in counting, we can be SURE the 6th seal (wrath) will be opened before the 7th seal start of Jacob's 7 years of trouble. In Revelation, the 70th week goes from chapter 8 to chapter 16—from the 7th seal to the 7th bowl. (God has "marked" the week with sevens.) By the way, we meet Him IN THE CLOUDS, which is up into the air. That is where clouds are.
"Those are the saints that Christ brings with him and the saints of Rev 19." No, you are mistaken yet again. The saints Paul will bring with Him are the spirits of all the "dead in Christ;" all who have died "in Christ" since Jesus rose from the dead to become the Redeemer. You are half right: they are seen again after they have spent 7 years in heaven in resurrection bodies in chapter 19, ready for the marriage and supper. John saw them previously as the great crowd, too large to number, right after they had been caught up to heaven at the pre-trib rapture.
There is no mystery in Paul's use of "remain." At the pre-trib rapture, all humans on earth will be either those "in Christ" or those who are not in Christ. This goes for those who have passed since Jesus rose from the dead: some died "in Christ," but most died outside of knowing Christ. At the gathering, which will be exclusively for those "in Christ," first the dead in Christ rise, and that leaves those alive and in Christ remaining to be caught up. Then, ALL of those "in Christ" are caught up.
The "Day of the Lord" according to Isaiah comes with "wrath and fierce anger." Does that sound like the rapture? Paul explains that the rapture will come JUST BEFORE wrath or before the start of the Day of the Lord. Remember, those Paul wrote to in His second letter THOUGHT they were in the Day, but Paul explains to them that when people see the great departure, the rapture of the church, then see the man of sin revealed, THEN they will know the Day has started and they are in it. It's kind of funny: the church will depart and won't see the abomination—the man of sin revealed. We will be GONE! I take great comfort in that.