Remember David Koresh and the Branch Davidians? How about Marshall Applewhite and Heaven's Gate? There was also Jim Jones with the People's Temple in Jonestown, Guyana. They were all cults, all false teachers. They taught false doctrine and led the people astray.
The Bible teaches us over and over to avoid false teachings. It was a very real problem in the first century and will continue to be a problem right up until Jesus returns.
How do we guard ourselves against being led astray? Read your Bible, attend a good Bible teaching Church, find a good Bible Study group, research your questions from reputable sources.
Keep reading, keeping seeking and keep asking.
1 Timothy 1:3-4 NLT
3 When I left for Macedonia, I urged you to stay there in Ephesus and stop those whose teaching is contrary to the truth. 4 Don’t let them waste their time in endless discussion of myths and spiritual pedigrees. These things only lead to meaningless speculations, which don’t help people live a life of faith in God.
Blessings, Cecilia