According to John, the fifth trumpet plague is designed to effect all men, all except those with the seal of God in their foreheads.
Revelation 9
1And the fifth angel sounded, and I saw a star fall from heaven unto the earth: and to him was given the key of the bottomless pit.
2And he opened the bottomless pit; and there arose a smoke out of the pit, as the smoke of a great furnace; and the sun and the air were darkened by reason of the smoke of the pit.
3And there came out of the smoke locusts upon the earth: and unto them was given power, as the scorpions of the earth have power.
4And it was commanded them that they should not hurt the grass of the earth, neither any green thing, neither any tree; but only those men which have not the seal of God in their foreheads.
5And to them it was given that they should not kill them, but that they should be tormented five months: and their torment was as the torment of a scorpion, when he striketh a man.
6And in those days shall men seek death, and shall not find it; and shall desire to die, and death shall flee from them.
He earlier identifies those with the seal of God in their foreheads as the 144,000.
Revelation 7
2And I saw another angel ascending from the east, having the seal of the living God: and he cried with a loud voice to the four angels, to whom it was given to hurt the earth and the sea,
3Saying, Hurt not the earth, neither the sea, nor the trees, till we have sealed the servants of our God in their foreheads.
4And I heard the number of them which were sealed: and there were sealed an hundred and forty and four thousand of all the tribes of the children of Israel.
Conclusion: the only male Christians alive at the second coming of Christ will be the 144,000, the rest will have been martyred. If there were any other Christians alive at that time, then they would also be affected by this plague.
In Yehoshua,
Guy Smith