Revelation isn't a historical book, and it does have all to do with Islam. The only way to logically understand killing 1/3 of mankind is mainly through nuclear and biological terrorism, which is coming!
Revelation 9 has long been associated with the Arabs and Muslims for several reasons. Locust are figurative of the Arabs in the Old Testament and both scorpions and locust have the Mid-East as their natural habitat, especially in Arabia. In Arabic the word "Arab" and "locust" sound similar. The locust represent ‘the Arabs and Muslims.
Verse 2-3 "And 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. And there came out of the smoke locusts upon the earth: and unto them was given power, as the scorpions of the earth have power."
In Judges 6:5 and 7:12 the Midianites and the Amalekites, who are likely related to the Ishmaelites, are Arab tribes and are associated with grasshoppers or ‘LOCUST.’ Gesenius says that the Midianites are of an Arab nation, and the Amalekites are the descendants of Esau. In Genesis 37:25 the Midianites seem identified with the Ishmaelites. Strong's says Midian or Midianite' = "strife." Nahum says about the Arabs...
"Make thyself many as the locusts." Nah.3:5
The East wind brought the locust in Exodus 10:13 and is associated with 'falsehood, deceit, and evil'.
Exodus 10:13 And Moses stretched forth his rod over the land of Egypt, and the LORD brought an east wind upon the land all that day, and all that night; and when it was morning, the east wind brought the locusts.
Speaking of the Arabs, Judges 6:5 say’s...
"For they came up with their cattle and their tents, and they came as grasshoppers for multitude; for both they and their camels were without number: and they entered into the land to destroy it."
Revelation 9:11...
"And they had a king over them, which is the angel of the bottomless pit, whose name in the Hebrew tongue is Abaddon, but in the Greek tongue hath his name Apollyon."(destroyer)
Destroyer is one of the 99 names of Allah.
"And thus I saw the horses in the vision, and them that sat on them, having breastplates of fire... (suicide vest)
The word for breastplates is the word 'thorax,' and were held by straps that went over the shoulders or around the neck.
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"...and of jacinth," (dark red)...
From Vines....
Jacinth: signifies "hyacinthine," perhaps primarily having the color of the hyacinth. Some regard its color as that of the martagon lily, a dusky red.
According to Swete, the word 'jacinth' in Rev 9:17 is, "doubtless meant to describe the blue smoke of a sulphurous flame."
"...and brimstone:...." sparks and explosion. This is the only place the word 'brimstone' or Strong's #2306 is used in the NT. Strong's #2306 comes from 2303 and says, "in its original sense of
"flashing."
"...and the heads of the horses were as the heads of lions; (Babylonians) and out of their mouths issued fire and smoke and brimstone."
John even tells us how many jihadist there are in the world when this happens.
In 2006-7 a leading Mid-East expert said there were 300 million jihadist and 400 million Islamic radicals in the world. I thought that number to be a bit high on the jihadist but close on the radicals.
"And the number of the army of the horsemen were two hundred thousand thousand: and I heard the number of them."
That would be 200 million.