Aptly stated, but why are so many deceived?
So many are deceived because they seek the approval of others rather than of God and thus are not graced with the true faith. On that matter, see this: Why So Many Can't Believe. They are also deceived because they receive not the love of the truth and have not overcome themselves to a sufficient level to resist the world and do God’s will. All of this can be summarized as bad will.
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