Good point. False teachers are not genuine Christians, but are counterfeits and John 8: 24 tells us they will die under the curse of their sins. A true believer can never lose eternal life, nor will they live in sin or apostatize from their faith in Christ.I agree. But, also beware of false teachers. They don't even need to be in a cult group. So called "mainstream" Christianity has many of them.
Pastors should not be treated as a source of knowledge, understanding, and wisdom. Many brought harm to the flock during this pandemic.