2 Thessalonians 2:10-12 (KJV)..."And with all deceivableness of unrighteousness in them that perish; because they received not the love of the truth, that they might be saved. 11 And for this cause God shall send them strong delusion, that they should believe a lie:12 That they all might be damned who believed not the truth, but had pleasure in unrighteousness."
We are in the End Times, Prophecy shows us this. Is this time period, not where the above passage is going to be used. If so, then another prophecy is Being fulfilled.
I believe this will be a future prophesy,but we are at the end time,but it has not gotten to this point yet.
Rev 9:20 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:
Rev 9:21 Neither repented they of their murders, nor of their sorceries, nor of their fornication, nor of their thefts.
After the 6th trumpet the world will still not repent of their sins,and turn to God,so God gives them the beast to rule over them,for this war is at the time of the ten horn kingdom that covers the world,and they failed at keeping peace,and they turn to the beast for the solution to have peace on earth.
Rev 12:7 And there was war in heaven: Michael and his angels fought against the dragon; and the dragon fought and his angels,
Rev 12:8 And prevailed not; neither was their place found any more in heaven.
Rev 12:9 And the great dragon was cast out, that old serpent, called the Devil, and Satan, which deceiveth the whole world: he was cast out into the earth, and his angels were cast out with him.
Rev 12:10 And I heard a loud voice saying in heaven, Now is come salvation, and strength, and the kingdom of our God, and the power of his Christ: for the accuser of our brethren is cast down, which accused them before our God day and night.
Rev 12:17 And the dragon was wroth with the woman, and went to make war with the remnant of her seed, which keep the commandments of God, and have the testimony of Jesus Christ.
Rev 18:1 And after these things I saw another angel come down from heaven, having great power; and the earth was lightened with his glory.
Rev 18:2 And he cried mightily with a strong voice, saying, Babylon the great is fallen, is fallen, and is become the habitation of devils, and the hold of every foul spirit, and a cage of every unclean and hateful bird.
After the 6th trumpet God gives the world the beast to rule over them,and war will break out in heaven,and the devils are cast to earth,where the earth becomes their holding cell,and Satan appears as the beast to deceive all who do not love God.
Dan 8:23 And in the latter time of their kingdom, when the transgressors are come to the full, a king of fierce countenance, and understanding dark sentences, shall stand up.
Dan 8:24 And his power shall be mighty, but not by his own power: and he shall destroy wonderfully, and shall prosper, and practise, and shall destroy the mighty and the holy people.
Dan 8:25 And through his policy also he shall cause craft to prosper in his hand; and he shall magnify himself in his heart, and by peace shall destroy many: he shall also stand up against the Prince of princes; but he shall be broken without hand.
God is going to give the world 7 years to have their way,and cause all who do not love Him to follow the beast kingdom,so I believe the strong delusion God will send them is when the devils are cast to earth they will deceive all who do not love God,and they will follow the beast kingdom.