2Thessalonians 2:8 And then shall that Wicked be revealed, whom the Lord shall consume with the spirit of his mouth, and shall destroy with the brightness of his coming: 9 [Even him], whose coming is after the working of Satan with all power and signs and lying wonders, 10 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.
Since one quarter of mankind follows a violent, imperialistic, murderous, truth censoring, antichrist leader, with a scripture-contrary, history-devoid, archaeology-bankrupt, reality-rejecting, geographically-impossible so-called "tradition" - that masquerades as thousands of years of pre-Muhammad history but was all created and put to the pen in the 7th to 10th centuries AD without reference to any actual historical record that preceded the 5th century AD - Islam obviously qualifies as a "strong delusion". Indeed right down to the specifics of Muhammad's followers being required to deny the Lord that bought them, with the price He paid for us all, which is His precious shed blood:
2 Peter 2:1 But there were false prophets also among the people, even as there shall be false teachers among you, who privily shall bring in damnable heresies, even denying the Lord that bought them, and bring upon themselves swift destruction.
Let alone that Muhammad's followers blaspheme the Son of God and His crucifixion and shed blood, and reject God's gift of grace, as articles of their faith in the false prophet Muhammad alone.
Hebrews 10:29 Of how much sorer punishment, suppose ye, shall he be thought worthy, who hath trodden under foot the Son of God, and hath counted the blood of the covenant, wherewith he was sanctified, an unholy thing, and hath done despite unto the Spirit of grace?
Believing themselves to be saved by their own works rather than by the gift of God's grace.
Ephesians 2:8 For by grace are ye saved through faith; and that not of yourselves: it is the gift of God 9 Not of works, lest any man should boast.
Add to that the "deceivableness" of Islamic "taqiyyah" or lying in the way of "Allah" and dissimulation of this stand-alone antichrist anti-religion, and the "unrighteousness" of prostrating toward the Quraish pagan's black stone idol and Kaaba in Mecca five times a day, and praying in the "vain repetitions as the heathen do" in the names of the Arabian pagan's deity "Allah" and his "messenger" Muhammad, while practicing thinly veneered Arabian moon, sun star and jinn-devil worship rituals.
All founded on the stand-alone 23 year record of recitations of "revelations" of a single seventh century SW Arabian desert dwelling illiterate self-proclaimed "messenger", who commanded his followers to fight and subdue Christians and Jews, while preposterously proclaiming that it is instead YHWH's people that are the ones that are "deluded away from the truth":
Surah 9.29 Fight those who believe not in Allah nor the Last Day, nor hold that forbidden which hath been forbidden by Allah and His Messenger, nor acknowledge the religion of Truth, (even if they are) of the People of the Book, until they pay the Jizya with willing submission, and feel themselves subdued. 30 The Jews call 'Uzair a son of God, and the Christians call Christ the Son of God. That is a saying from their mouth; (In this) they but imitate what the Unbelievers of old used to say. God's curse be on them: how they are deluded away from the Truth!
1 John 2:22 Who is a liar but he that denieth that Jesus is the Christ? He is antichrist, that denieth the Father and the Son. 23 Whosoever denieth the Son, the same hath not the Father: [(but) he that acknowledgeth the Son hath the Father also].
Quran Surah 19:88 They say: "(Allah) Most Gracious has begotten a son!" 89 Indeed ye have put forth a thing most monstrous!
2John 1:9 Whosoever transgresseth, and abideth not in the doctrine of Christ, hath not God. He that abideth in the doctrine of Christ, he hath both the Father and the Son.
John 3:36 He that believeth on the Son hath everlasting life: and he that believeth not the Son shall not see life; but the wrath of God abideth on him.
With one quarter of mankind following their murderous "messenger" Muhammad, who was as opposite to Jesus Christ, as his anti-religion of Islam is to the Gospel - indeed as inverted as the negative is to a photograph - through the traditional historicist approach to prophecy it isn't difficult to consider Muhammad as perhaps:
2Thessalonians 2:9 [Even him], whose coming is after the working of Satan with all power and signs and lying wonders,
While the bracketed "even him" is added as a translation helper word and doesn't occur in the Koine Greek, the verse works just as well with Muhammad's followers and his Islamic kingdom "beast" as being the "'whose' coming is after the working of Satan" by denying the crucifixion of Christ, and blaspheming the Son of God as articles of their faith in Muhammad alone. Those "whose" "messenger" commanded them to conquer and subjugate all people in the world to denying the Son of God and disbelieving His crucifixion and thereby rejecting His shed blood that would save them.
Checking Strong's for the Greek term "se-meion" translated as "signs":
1. a sign, mark, token
A. that by which a person or a thing is distinguished from others and is known
Who could deny that Muhammad is known for his Quran and has been distinguished from others by it for 1400 years? For heaven's sake, for a Muslim to confess that Jesus is the Son of God, or even to pray in Jesus' name constitutes the single most "heinous" and only unforgivable sin ("shirk") in Islam, as opposed to child rape or cold-blooded mass-murder which may be forgiven. For more on shirk in Muhammad's followers own words please click here.