The trick to successfully pulling off an apostasy is to distract people into thinking there hasn’t been one. The “believers” need to think everything remains intact.
So the issue of “apostasy” becomes a discussion about individuals and individual conformity to the expectations of the group. The subject can then be a topic that polite, fellow-believers can discuss without ever searching into the overall condition of a fallen people.
The Jews mocked efforts to tell them they were apostate. They thought it was humorous when Lehi preached the idea. (1 Ne. 1: 19.) Because they were so very religious, so devout, so unassailably active in following God, the idea was absolutely laughable that they were apostate.
The Apostle Paul said the problem would begin at the top with the shepherds, who would teach them falsehoods as truth. (Acts 20: 29-30.) These new leaders would have only a form of godliness, without any real power to save. (2 Tim. 3: 5.)
The Christian world adopted another, false replacement of the original church. It became so universal it was hailed as the Universal, or Catholic Church. It ruled from the rivers to the ends of the earth as the only official form of the faith established by Christ.
To pull this off Satan must be concerned with the “macro” institutional failure, not just individuals falling away. It is the small, minor spirits who follow Lucifer who engage in petty tempting of individuals to sin. Success for the Adversary is not accomplished in petty enterprises. He wants failure for the whole, so none can be saved. For that, apostasy must be universal.
He has never succeeded by admitting there has been a failure. The trick is always to have the apostasy come unnoticed, unacknowledged and from within. (See 3 Ne. 16: 10.)
The topic is worth studying. When apostasy is noticed, acknowledged and exposed, then it is possible to repent and return. Until then, it progresses apace, discarding and rejecting what might have been given. All the while being happily ignored by “believers” whose devotion will not save.
Since Christ predicted that at some point the latter-day gentiles would reject the fullness (Id.), we probably should consider what the Book of Mormon has to say about the subject.
To finish the thought about the “trick to apostasy” the D&C has a remarkable statement. Lucifer succeeds when he manages to get us NOT to reject ordinances, but to change them. As soon as they are changed, they are broken. (D&C 1: 15.) That is an important step. Because then religious people can continue to claim they follow a true religion, while practicing one that has been broken. These practitioners become like the ancient Jews, who mocked Lehi because they knew they were still righteous. They knew Lehi was foolish, even fraudulent. They still had the truth, the ordinances, the temple, and the priesthood. Lehi was just a mistaken crank.