I do not believe the 200 million army are human beings... The Bible does not clearly identify their origin..
They are not the Army of the Anti-Christ
Revelation 9: KJV
13 "And the sixth angel sounded, and I heard a voice from the four horns of the golden altar which is before God, {14} Saying to the sixth angel which had the trumpet, Loose the four angels which are bound in the great river Euphrates. {15} 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. {16} And the number of the army of the horsemen were two hundred thousand thousand: and I heard the number of them. {17} 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. {18} 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. {19} 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."