Just as when it says the whole world was flooded in Noah's flood but it truely wasn't the entire thing, the same applies here. This also does not mean an all inclusive "all".
 

1 Corinthians 15:50 Now this I say, brethren, that flesh and blood cannot inherit the kingdom of God; neither doth corruption inherit incorruption.
 

Who is he talking to? The world or the brethren?
 

1 Corinthians 15:51 Behold, I shew you a mystery; We shall not all sleep, but we shall all be changed,

The "we" here is the brethren. When Christ returns only those with the seal of God shall be changed., the rest are yet in flesh bodies.
 

Revelation 19:17 And I saw an angel standing in the sun; and he cried with a loud voice, saying to all the fowls that fly in the midst of heaven, Come and gather yourselves together unto the supper of the great God;

This is concerning the great battle of Armageddon.

Revelation 19:18 That ye may eat the flesh of kings, and the flesh of captains, and the flesh of mighty men, and the flesh of horses, and of them that sit on them, and the flesh of all men, both free and bond, both small and great.
Revelation 19:19 And I saw the beast, and the kings of the earth, and their armies, gathered together to make war against him that sat on the horse, and against his army.

Thats a lot of flesh my friend, and it shall be for the very fowls of heaven to devour, and there shall be plenty of it.

Revelation 19:21 And the remnant were slain with the sword of him that sat upon the horse, which sword proceeded out of his mouth: and all the fowls were filled with their flesh.

This happens after the 7th trump sounds, and satans army is made up of flesh men. Lets go see when satan gathered this army and who he recruited.
 

Revelation 16:12 And the sixth angel poured out his vial upon the great river Euphrates; and the water thereof was dried up, that the way of the kings of the east might be prepared.
Revelation 16:13 And I saw three unclean spirits like frogs come out of the mouth of the dragon, and out of the mouth of the beast, and out of the mouth of the false prophet.
Revelation 16:14 For they are the spirits of devils, working miracles, which go forth unto the kings of the earth and of the whole world, to gather them to the battle of that great day of God Almighty.
Revelation 16:15 Behold, I come as a thief. Blessed is he that watcheth, and keepeth his garments, lest he walk naked, and they see his shame.
Revelation 16:16 And he gathered them together into a place called in the Hebrew tongue Armageddon.
 

Satan gathers this army during the 6th vial, in order to attempt to fight Christ and His army. Naturally this is a doomed venture as flesh has little chance against an army of angelic beings led by the King of Kings.
 
 

Zechariah 14:12 And this shall be the plague wherewith the LORD will smite all the people that have fought against Jerusalem; Their flesh shall consume away while they stand upon their feet, and their eyes shall consume away in their holes, and their tongue shall consume away in their mouth.

Their deaths are called a plague. This is not the beautiful transformation that Paul speaks of but a painful, horrible way to die and they honestly deserve it.
 

When they go to fight against Christ, they shall yet be in the flesh and Christ shall slay them and they shall change the hard way, by physical death.
 

Ezekiel 32:4 Then will I leave thee upon the land, I will cast thee forth upon the open field, and will cause all the fowls of the heaven to remain upon thee, and I will fill the beasts of the whole earth with thee.
Ezekiel 32:5 And I will lay thy flesh upon the mountains, and fill the valleys with thy height.
Ezekiel 32:6 I will also water with thy blood the land wherein thou swimmest, even to the mountains; and the rivers shall be full of thee.
 
 

Ezekiel 39:1 Therefore, thou son of man, prophesy against Gog, and say, Thus saith the Lord GOD; Behold, I am against thee, O Gog, the chief prince of Meshech and Tubal:
Ezekiel 39:2 And I will turn thee back, and leave but the sixth part of thee, and will cause thee to come up from the north parts, and will bring thee upon the mountains of Israel:
Ezekiel 39:3 And I will smite thy bow out of thy left hand, and will cause thine arrows to fall out of thy right hand.
Ezekiel 39:4 Thou shalt fall upon the mountains of Israel, thou, and all thy bands, and the people that is with thee: I will give thee unto the ravenous birds of every sort, and to the beasts of the field to be devoured.
Ezekiel 39:5 Thou shalt fall upon the open field: for I have spoken it, saith the Lord GOD.
Ezekiel 39:6 And I will send a fire on Magog, and among them that dwell carelessly in the isles: and they shall know that I am the LORD.
 

Revelation 16:21 And there fell upon men a great hail out of heaven, every stone about the weight of a talent: and men blasphemed God because of the plague of the hail; for the plague thereof was exceeding great.

This takes place in the 7th trump. Now, if everyone were changed then who exactly would be killed by this hail?

Eastons Dictionary: Talent

 of silver contained 3,000 shekels (Ex. 38:25, 26), and was equal to 94 3/7 lbs. avoirdupois. The Greek talent, however, as in the LXX., was only 82 1/4 lbs. It was in the form of a circular mass, as the Hebrew name kikkar denotes. A talent of gold was double the weight of a talent of silver (2 Sam. 12:30). Parable of the talents (Matt. 18:24; 25:15).

This is easily enough weight to kill a flesh man. If these are already changed into the spiritual body then that would mean they would be killed by the hail as well as by Christ in the battle. God is not going to change them into the spiritual body only to kill them seconds later and then have to re-change them again. This doesn't make sense, and it simply won't happen that way.
 

So, some are indeed changed at the 7th trump which will be those of the elect, but those who follow satan shall be punished and killed before being given a spiritual body.






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