(3) Let no one deceive you by any means; for that Day will not come unless the falling away comes first, and the man of sin is revealed, the son of perdition, (4) who opposes and exalts himself above all that is called God or that is worshiped, so that he sits as God in the temple of God, showing himself that he is God.
(7) For the mystery of lawlessness is already at work; only He who now restrains will do sountil He is taken out of the way. (8) And then the lawless one will be revealed, whom the Lord will consume with the breath of His mouth and destroy with the brightness of His coming. (9) The coming of the lawless one is according to the working of Satan, with all power, signs, and lying wonders, (10) and with all unrighteous deception among those who perish, because they did not receive the love of the truth, that they might be saved. (11) And for this reason God will send them strong delusion, that they should believe the lie, (12) that they all may be condemned who did not believe the truth but had pleasure in unrighteousness.
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In II Thessalonians 2, Paul leaves out some significant details. For example, in verse 10, he writes of the love of the truth, but he does not specify which truth he has in view. In verse 11, he speaks of believing “the lie,” but fails to identify it. He also mentions not believing the truth in verse 12, but provides no specifics.
The truth to which he refers does not have to indicate the doctrines that only the church of Godunderstands. It could be as common as the truth that there is a God. The Creator gave the nation of Israel tremendous truth, truth His people could grasp even without the Holy Spirit. Likewise, He has given all humanity truth for which it is accountable, which is why Paul writes that mankind is without excuse (Romans 1:20). In Romans 1:18, he mentions men suppressing the truth in unrighteousness, and the truth under discussion is the simple truth that a Creator God exists, and He requires mankind's worship.
However, today we are witnessing a defection from even this basic reality. As human knowledge has increased, people have misused it to deny the existence of a Creator. The theory of evolution functions as a prop so people do not have to face this reality. Evolution—now at the core of Western culture—is blindly accepted but rarely “proved” individually. Even so, the Western world has subscribed to it so extensively that a person is not taken seriously if he speaks of Creation.
A second basic truth that is being forsaken is that Jesus is the Christ and the Son of God. The apostle John gives this as an attribute of those who are “anti-Christ,” and he uses the existence of such beliefs as proof that it was already the last hour (see I John 4:1-3). We are seeing people divorce themselves from this truth as well. People will say that Jesus existed, but that He was not God but a created being, that He was just a prophet, or that He later settled down with Mary Magdalene and had children. Islam declares that the very idea of God having a Son is blasphemous. Thus, the basic truth about the nature of God—the Father and the Son—is not only being forsaken in the West, but it is also a cause for increasing persecution.
The number of those who hold even these basic truths is declining in the United States, both as a percentage of the population as well as the total number. The biggest declines are in the numbers of Catholics and mainline Protestants, but even the evangelicals' numbers are declining. Conversely, the number of Americans who claim no religious affiliation—the “nones”—is increasing, and now nearly one-fifth of Americans who were raised with a religion now profess to have none.
In Survey: Christians Are Not Spreading the Gospel (November 30, 2017), pollster George Barna observes:
Given the dominant influence on peoples' decision to embrace Christ [i.e. the environment during one's youth], the future is not promising for Christianity unless current patterns change. The adults who are of parenting age are part of the generation that is least likely to be born again, suggesting that the existing and coming segments of children in America are also less likely to embrace the gospel.
Even as the number of “nones” is swelling, the number of Americans with non-Christian beliefs, such as Islam and Hinduism, is also growing. Though the relative numbers are smaller, Wicca and unabashed Satanism are surging. More sobering still is that the U.S. is the most “Christian” of all the nations of Israel. The other Israelitish nations have fallen away even more. In Britain, more people attend mosques each week than churches. We are seeing a falling away from—a forsaking of—even basic truth and a ready acceptance of just about anything else.
Even among those who still profess a belief in the Father and the Son, such belief is becoming so anemic that it is not translating into everyday life. Whereas nominal Christianity was once a bulwark against obvious immorality, now it is succumbing to fluid definitions of murder, marriage, stealing, and lying. It is operating under increasingly shallow ideas of righteousness, grace, love, and obligation. Mainstream Catholics and Protestants may retain their professions of faith, but in practical terms, they are defecting from what truth they formerly held.
— David C. Grabbe