"For the time will come when they will not endure sound doctrine, but according to their own desires, because they have itching ears, they will heap up for themselves teachers; and they will turn their ears away from the truth, and be turned aside to fables." 2 Tim 4:3-4
GotQuestions:
What is apostasy and how can I recognize it?
With respect to apostasy, it is critical that all Christians understand two important things: (1) how to recognize apostasy and apostate teachers, and (2) why apostate teaching is so deadly.
The Forms of Apostasy
To fully identify and combat apostasy, it is important that Christians understand its various forms and the traits that characterize its doctrines and teachers. As to the forms of apostasy, there are two main types: (1) a falling away from key and true doctrines of the Bible into heretical teachings that proclaim to be “the real” Christian doctrine, and (2) a complete renunciation of the Christian faith, which results in a full abandonment of Christ.
Read more: https://www.gotquestions.org/apostasy.html
Related:
How can I recognize a false teacher / false prophet? - GotQuestions
False Teachers - One Way Jesus
Biblical Warning About False Teachers - One Way Jesus
False Converts Teaching False Doctrine Are Leading Professing Evangelical Christians Astray - Christian Research Network