We all know that everything with him started with a revelation which a spirit told him to do this and that and eventually that spirit turned out to be against the biblical fundamentals.
Lee is the founder of the Shincheonji Church of Jesus the Temple of the Tabernacle of the Testimony (SCJ), a South Korean Christian group, that has been accused of being a religious cult, who has claimed that Jesus Christ appeared before him as a "bright heavenly figure". - Wikipedia
I can say he is under a influence of a Spirit which is not of "God's". But definitely from evils. Because Satan can also disguise himself as angel of light (1 Cor 11:14). That means when we explore we can see that the spiritual interactions vary (Some pretends to be as souls / ghosts of deceased people, other pretended to be spirit guides, demons etc...). Examples we can see by looking at psychics, gurus, mediums, sorcerers, magicians, astrologers etc...
However some spirit that claiming to be Jesus Christ affecting this man to allow himself as a appointed one. The particular unclean spirit seems to have affected him leveraging what he had experienced in his younger age via disappointments and preceding cult figures.
The teachings branch off from their earlier cults and these are not Lee's original doctrines. And little doctrinal changes happened thereafter due to inconsistencies and instabilities (+/-).
When compared to the bible, his teachings of the parables, prophesies and fulfillments are 90% running out of context. Meanings of figurative words and incidents taken from other books of the bible without the original context (Ex. Isaiah 34:16 really means about the pair of birds, But he teach it as bible verses comes in pairs and have paired meanings). You could read other articles for more insight on error of explaining figurative languages.
If he has the Spirit of God, he will not preach apart from the bible. And he will show the real meaning of the verses if those are elaborated in context. He will humble himself as a human and exalt God and He will lead the people to Jesus alone; not towards himself. By this we clearly know he made self-interpretations and misusing bible. The unclean spirit does the same thing too.
Back to the point, the problem is an unclean spirit is deceiving Lee Man Hee to deceive others (By coming as another Jesus apart from the bible). And that spirit told him that he will become immortal too; yet his health is not in good condition as at now. The followers too deceived a lot with this deception.
So by reading all of this what you can think as a conclusion?
If the leader himself is deceived by an unclean spirit, the people who drink from his fountain (take his words) also getting the involvement in those unclean spiritual act.
We need to be aware and careful of the unclean Spirits which comes and preach another gospel than of the bible (Gal 1:8).