Final Seven Year Death Toll and who and how many are allowed into His Kingdom:
These calculations are based on the following assumptions:
-7.5 Billion is the current and starting population.
-54% of these live in urban (major city areas) remember this percentage.
-28% live on the islands of the earth including the large islands like Australia, remember this percentage.
*Estimates are conservative
1st 3.5 years PERSECUTIONS
¼ of earth's 7.5 Billion population are killed in the first 3.5 years of the Tribulation as indicated by the 4th Seal: 1.8 Billion:
Revelation 6:  And I looked, and behold a pale horse: and his name that sat on him was Death, and Hell followed with him. And power was given unto them over the fourth part of the earth, to kill with sword, and with hunger, and with death, and with the beasts of the earth.
5.7 BILLION estimated to REMAIN on earth
Then come the first 4 TRUMPETS near the 3.5 year point of the Beginning of Sorrows our Lord prophesied:
Revelation 8:  The first angel sounded, and there followed hail and fire mingled with blood, and they were cast upon the earth: and the third part of trees was burnt up, and all green grass was burnt up.
Number of the dead not specified.
 And the second angel sounded, and as it were a great mountain burning with fire was cast into the sea: and the third part of the sea became blood;
 And the third part of the creatures which were in the sea, and had life, died; and the third part of the ships were destroyed.
Number of the dead not specified.
 And the third angel sounded, and there fell a great star from heaven, burning as it were a lamp, and it fell upon the third part of the rivers, and upon the fountains of waters;
 And the name of the star is called Wormwood: and the third part of the waters became wormwood; and many men died of the waters, because they were made bitter.
Number of the dead not specified.
 And the fourth angel sounded, and the third part of the sun was smitten, and the third part of the moon, and the third part of the stars; so as the third part of them was darkened, and the day shone not for a third part of it, and the night likewise.
4.7 BILLION people estimated to REMAIN on the earth.
Then come the last 3 Trumpets: 1/3 of what remains of people alive at this time DIE (still in the 45 day period at the mid-point of the tribulation):
Rev 9: 14] Saying to the sixth angel which had the trumpet, Loose the four angels which are bound in the great river Euphrates.
 And the four angels were loosed, which were prepared for an hour, and a day, and a month, and a year, for to slay the third part of men.
 And the number of the army of the horsemen were two hundred thousand thousand: and I heard the number of them.
 And thus I saw the horses in the vision, and them that sat on them, having breastplates of fire, and of jacinth, and brimstone: and the heads of the horses were as the heads of lions; and out of their mouths issued fire and smoke and brimstone.
 By these three was the third part of men killed, by the fire, and by the smoke, and by the brimstone, which issued out of their mouths.
 For their power is in their mouth, and in their tails: for their tails were like unto serpents, and had heads, and with them they do hurt.
 And the rest of the men which were not killed by these plagues yet repented not of the works of their hands, that they should not worship devils, and idols of gold, and silver, and brass, and stone, and of wood: which neither can see, nor hear, nor walk:
 Neither repented they of their murders, nor of their sorceries, nor of their fornication, nor of their thefts.
3 BILLION people estimated to REMAIN on the earth.
Catching Away of the remnant of His Bride Occurs at this point
Last 3.5 years GOD’s WRATH:
2/3 of all synagogue of Satan (fake jews) will be destroyed (14 million):
Zechariah 13:  And it shall come to pass, that in all the land, saith the LORD, two parts therein shall be cut off and die; but the third shall be left therein.  And I will bring the third part through the fire, and will refine them as silver is refined, and will try them as gold is tried: they shall call on my name, and I will hear them: I will say, It is my people: and they shall say, The LORD is my God SEE REV 16: 19
Revelation 16:  And I heard a great voice out of the temple saying to the seven angels, Go your ways, and pour out the vials of the wrath of God upon the earth.
 And the first went, and poured out his vial upon the earth; and there fell a noisome and grievous sore upon the men which had the mark of the beast, and upon them which worshipped his image.
 And the second angel poured out his vial upon the sea; and it became as the blood of a dead man: and every living soul died in the sea.
 And the third angel poured out his vial upon the rivers and fountains of waters; and they became blood.
 And I heard the angel of the waters say, Thou art righteous, O Lord, which art, and wast, and shalt be, because thou hast judged thus.
 For they have shed the blood of saints and prophets, and thou hast given them blood to drink; for they are worthy.
 And I heard another out of the altar say, Even so, Lord God Almighty, true and righteous are thy judgments.
 And the fourth angel poured out his vial upon the sun; and power was given unto him to scorch men with fire.
 And men were scorched with great heat, and blasphemed the name of God, which hath power over these plagues: and they repented not to give him glory.
 And the fifth angel poured out his vial upon the seat of the beast; and his kingdom was full of darkness; and they gnawed their tongues for pain,
 And blasphemed the God of heaven because of their pains and their sores, and repented not of their deeds.
Number of the dead from these VIALS is not specified but conservatively estimated at a billion dead.
 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.
 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.
 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.
 Behold, I come as a thief. Blessed is he that watcheth, and keepeth his garments, lest he walk naked, and they see his shame.
 And he gathered them together into a place called in the Hebrew tongue Armageddon.
 And the seventh angel poured out his vial into the air; and there came a great voice out of the temple of heaven, from the throne, saying, It is done.
Every soldier of every nation will be destroyed utterly by Our Lord at the battle of Armageddon 200 plus MILLION
1.5 BILLION estimated people REMAIN on the earth.
 And there were voices, and thunders, and lightnings; and there was a great earthquake, such as was not since men were upon the earth, so mighty an earthquake, and so great.
 And the great city was divided into three parts, and the cities of the nations fell: and great Babylon came in remembrance before God, to give unto her the cup of the wine of the fierceness of his wrath. Referenced above in Zechariah 13
** More evidence of the Mother of Harlots influence and control over all the religion on the earth. All are corrupted and adulterous against the God of Heaven.
Major city populations destroyed: 54% of whatever is left alive at this point
 And every island fled away, and the mountains were not found.
Island populations of the world were recalculated based on previous death tolls - 28% of the world’s population lives on Islands.
 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.
Hail death counts are not specified but would be extreme.
500 MILLION estimated to REMAIN
Leaving a conservative estimate of 500 million people after the Battle of Armageddon marking the end of the final 7-years before our Lord's Return to reclaim His possession from Satan and the beginning of the Millennial Kingdom.
The destruction of all towered cities indicates that the predominant amount of people still alive in the end of the final seven years will live in RURAL areas and these will be judged by our Lord to determine their entrance into His Millennial Kingdom.
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