The Bible makes it clear why God is sending a strong delusion in the end times: “They perish because they refused to love the truth and so be saved. For this reason God sends them a powerful delusion so that they will believe the lie and so that all will be condemned who have not believed the truth but have delighted in wickedness” (2 Thessalonians 2:10–12). Simply put, God sends a strong delusion to those who chose not to believe the gospel of Christ. Those who take delight in mocking and rejecting Him, He will condemn.
It is man’s choice whether to accept and believe the truth of Jesus Christ as presented in the Scriptures. To receive the truth and the love God offers is in keeping with its teachings, “This is love for God: to obey His commands” (1 John 5:3). Conversely, to know the truth and not obey it is to face the wrath of God: “The wrath of God is being revealed from heaven against all the godlessness and wickedness of men who suppress the truth by their wickedness” (Romans 1:18). Frankly speaking, there is no more dangerous condition for man than to know the truth and refuse to obey it. To do so is to harden the heart and make God’s condemnation sure.
When one knows the truth and refuses to obey it, he is subject to any lie, any deception, any untruth that man can conjure up. “For although they knew God, they neither glorified Him nor gave thanks to Him, but their thinking became futile and their foolish hearts were darkened. Although they claimed to be wise, they became fools” (Romans 1:21–22). Paul goes on in next few verses to describe the mindset and behaviors of those who disbelieve (see Romans 1:29–31). As a result of man’s foolishness and his arrogant disdain of the things of God, “God gave them over to a depraved mind, to do what ought not to be done” (Romans 1:28). And correspondingly, “Although they know God’s righteous decree that those who do such things deserve death, they not only continue to do these very things, but also approve of those who practice them” (Romans 1:32).
Isaiah puts it succinctly: “They have chosen their own ways, and their souls delight in their abominations; so I [God] also will choose harsh treatment for them and bring upon them what they dread. For when I called, no one answered, when I spoke, no one listened. They did evil in My sight and chose what displeases Me” (Isaiah 66:3–4).
When men know the truth and refuse to receive it, when they refuse to obey it and hold it in unrighteousness, “they will be condemned for enjoying evil rather than believing the truth” (2 Thessalonians 2:12 NLT).
“God is love” (1 John 4:16). He is not some cruel monster who deliberately and inwardly delights in preparing people for everlasting condemnation. But He earnestly and lovingly proclaims the gospel of Christ, “not wanting anyone to perish, but everyone to come to repentance” (2 Peter 3:9).
Throughout the Scriptures, God urges people to accept the truth. But when people reject Him and spurn His message, then—and not until then—God hardens them and turns them over to a deluded mind to wallow in their wickedness to their eternal damnation. This is what the Lord says about those who choose to reject the truth: “They greatly love to wander; they do not restrain their feet. So the Lord does not accept them; He will now remember their wickedness and punish them for their sins” (Jeremiah 14:10).
 Got Questions Ministries. (2010). Got Questions? Bible Questions Answered. Bellingham, WA: Logos Bible Software.