Firstly, where does that word 'rapture' come from, because it's not in the Greek manuscripts of The New Testament?
It comes from a Latin translation of the Greek word 'harpazo', which means 'to seize' or 'take away'. In the KJV Bible Greek harpazo is translated as "caught up", etc. (1 Thess.4:17; Matt.13:19; John 6:15; John 10:12; John 10:28; Acts 8:39; 2 Cor.12:2 & 12:4).
The thing that I find many brethren are confused about, is that Apostle Paul in 1 Thessalonians 4 showed that the saints still alive when Jesus descends from Heaven are "caught up" immediately after the dead saints are RESURRECTED first. Paul showed the asleep saints will be raised first (1 Thess,4:16). Per John 6:40, Jesus showed the future resurrection is to happen on the LAST DAY of this world.
That means brethren, that Jesus comes to gather His Church on the last day... of this world, which is when the future resurrection of the asleep saints also happens. In other Scripture, like 1 Thess.5, Apostle Paul showed that day of Christ's future coming "as a thief" will be on the "day of the Lord". Jesus Himself showed us that in Revelation 16:15 within the 6th Vial timing when He declared that He comes "as a thief".
So why... would a faithful servant of Jesus Christ want to listen to men's doctrines that steer one away from the written Scripture about Lord Jesus coming AFTER... the tribulation to gather His Church, that being Lord Jesus' Own declaration of the time of His future return, as written? Why would anyone listen to men instead of our Lord Jesus Christ?
The below Scripture by Lord Jesus aligns perfectly with the gathering of the Church that Apostle Paul taught in 1 Thessalonians 4:
Matt 24:29-31
29 Immediately after the tribulation of those days shall the sun be darkened, and the moon shall not give her light, and the stars shall fall from heaven, and the powers of the heavens shall be shaken:
30 And then shall appear the sign of the Son of man in heaven: and then shall all the tribes of the earth mourn, and they shall see the Son of man coming in the clouds of heaven with power and great glory.
31 And He shall send His angels with a great sound of a trumpet, and they shall gather together His elect from the four winds, from one end of heaven to the other.
KJV
Two groups of saints are gathering when Jesus descends from Heaven according to Apostle Paul in 1 Thess.4. The 'asleep' saints that have died Paul said that Jesus will bring with Him when He comes (1 Thess.4:13-16). That's the above group that is gathered "from one end of heaven to the other." And Paul said those will be resurrected first.
Mark 13:24-27
24 But in those days, after that tribulation, the sun shall be darkened, and the moon shall not give her light,
25 And the stars of heaven shall fall, and the powers that are in heaven shall be shaken.
26 And then shall they see the Son of man coming in the clouds with great power and glory.
27 And then shall He send His angels, and shall gather together His elect from the four winds, from the uttermost part of the earth to the uttermost part of heaven.
KJV
But the above example is different than the Matt.24 version. Here Jesus is pointing to the saints still alive... on earth being gathered, "...from the uttermost part of the earth...". These are "caught up" per 1 Thessalonians 4:17. This is what many call a 'rapture'.
I find that many brethren on men's pre-tribulational rapture theory don't actually understand what Apostle Paul taught about the gathering of the Church in 1 Thess.4. Something is terribly wrong in Denmark because of their belief on man's pre-trib rapture idea. Lord Jesus simply did not teach that idea.