Either take of die.
The innumerable number refused it and billions die.
No postrib rapture
Matthew 24 (New King James Version)
22And
unless those days were shortened, no flesh would be saved; but
for the [c]elect’s sake those days will be shortened.
The Coming of the Son of Man
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.
30Then 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.
31And He will send His angels with a great sound of a trumpet, and
they will gather together His [d]elect from the four winds, from one end of heaven to the other.
The days are shortened for the sake of the elect survivors of flesh, otherwise no flesh would have survived the great tribulation. At the end God's angels gather the elect survivors, from every nation, people, tribe and tongue, from the four winds of the world. Not all the elect will survive the great tribulation though, and they are the ones referred to in Revelation 7:9-17.
Some flee into the wilderness, and escape captivity or death during the great tribulation:
Luke 21 (New King James Version)
36Watch therefore, and pray always that you may be counted worthy to escape all these things that will come to pass, and to stand before the Son of Man.”
Of those that do not escape, some will be taken captive, some will be slain.
Revelation 13 (English Standard Version)
10If anyone is to be taken captive,
to captivity he goes;
if anyone is to be slain with the sword,
with the sword must he be slain.
Here is a call for the endurance and faith of the saints.
Those who died during the great tribulation:
Revelation 7 (New King James Version)
A Multitude from the Great Tribulation
9After these things I looked, and behold, a great multitude which no one could number, of all nations, tribes, peoples, and tongues, standing before the throne and before the Lamb, clothed with white robes, with palm branches in their hands,
10and crying out with a loud voice, saying, “Salvation belongs to our God who sits on the throne, and to the Lamb!”
11All the angels stood around the throne and the elders and the four living creatures, and fell on their faces before the throne and worshiped God,
12saying:
“Amen! Blessing and glory and wisdom,
Thanksgiving and honor and power and might,
Be to our God forever and ever.
Amen.”
13Then one of the elders answered, saying to me, “Who are these arrayed in white robes, and where did they come from?”
14And I said to him, “Sir, you know.” So he said to me, “These are the ones who come out of the great tribulation, and washed their robes and made them white in the blood of the Lamb.
15Therefore they are before the throne of God, and serve Him day and night in His temple. And He who sits on the throne will dwell among them.
16They shall neither hunger anymore nor thirst anymore; the sun shall not strike them, nor any heat;
17for the Lamb who is in the midst of the throne will shepherd them and lead them to
[c]living fountains of waters. And God will wipe away every tear from their eyes.”