The Protestant Fundamentalist view of the “Rapture” is that at some time before the great tribulation during the end times faithful Christians will simply vanish and meet with Christ. Their theory is that Christ will gather His elect and everyone else will be left behind. They mostly refer to 1 Thessalonians 4:15-17:
For this we say to you by the word of the Lord, that we who are alive and remain until the coming of the Lord will by no means precede those who are asleep. 16 For the Lord Himself will descend from heaven with a shout, with the voice of an archangel, and with the trumpet of God.
And the dead in Christ will rise first. 17 Then we who are alive and remain shall be caught up together with them in the clouds to meet the Lord in the air. And thus we shall always be with the Lord.
However, there is more scripture that directly defeats the interpretation they take from 1 Thessalonians.
Matthew 24: 29-31
29 “
Immediately after the tribulation of those days the sun will be darkened, and the moon will not give its light; the stars will fall from heaven, and the powers of the heavens will be shaken. 30
Then the sign of the Son of Man will appear in heaven, and then all the tribes of the earth will mourn, and they will see the Son of Man coming on the clouds of heaven with power and great glory. 31** And He will send His angels with a great sound of a trumpet, and they will gather together His elect from the four winds, from one end of heaven to the other.**
Mark 13: 24-27
24 “But in those days,
after that tribulation, the sun will be darkened, and the moon will not give its light; 25 the stars of heaven will fall, and the powers in the heavens will be shaken. 26
Then they will see the Son of Man coming in the clouds with great power and glory. 27 And then He will send His angels, and gather together His elect from the four winds, from the farthest part of earth to the farthest part of heaven.
There are many more that go against this teaching as well, but for their theory of the “rapture”, would mean Christ would have to come back pick up some people and then come back again for the rest.

Christ is only coming a second time and no one knows the hour or the day. I believe during the great tribulation, whenever that may be, our faith will be tested. Scripture says that we will be persecuted for Christ’s name.