Most of the supernatural events that is not of Him is when they preach to saved believers to seek to receive Jesus Christ/Holy Spirit again or for the first time, apart from salvation after a sign of tongues or other signs in the flesh.
That is the falling away from the faith Paul was speaking about as he reminded believers when they had received the sanctification of the Spirit and the belief of the truth which was at the calling of the gospel in 2 Thessalonians 2:13-15
So regardless of miracles and healing being done in His name.....that iniquity alone will have the Lord denying knowing them, because that work of iniquity which denies Him is the reason He will deny knowing them.... unless they repent in time with His help to discern and to depart from that iniquity before the Bridegroom comes. Matthew 7:21-27
So 1 John 4:2 is another way of saying 2 Corinthians 13:5 wherein the Holy Spirit is in us as promised by faith in Jesus Christ; not by tongues or any other signs that serve the believer in relations to his or her salvation. 1 John 4:3-4 is saying that since the Holy Spirit is in us as per 1 John 4:2, then that other spirit coming over you apart from salvation is not the Holy Spirit. And that tongue that it brings is the same supernatural tongue found in the world and in the occult as vain & profane babbling. Isaiah 8:19 testifies of this tongue used by wizards consulting familiar spirits. 1 Timothy 4:1-2 prophesied of believers falling away from the faith in giving heed to seducing spirits and doctrines of devils even in hypocrisy as some will acknowledged that the Holy Spirit is in them and yet seek to receive Him again after a sign.
2 Thessalonians 2:7 of the iniquity already at work in Paul's day as he who lets will let until he be taken out of the way sums up wayward believers mentality these days when they "open" themselves up to receive spirits after a sign, thinking it is the Holy Spirit when He was already in them as promised at their salvation.
It is for this cause that God permitted a strong delusion to occur for believing that lie that they can receive the Holy Spirit separate from salvation after a sign. They run the risk of damnation by being left behind as reprobates; disqualified to attend the Marriage Supper at the pre trib rapture event, and thus shall be received later on as vessels unto dishonor in His House. 2 Thessalonians 2:9-12
Make no mistake. These wayward believers are still saved as Paul continued to talk about those falling away from the faith in the 3rd chapter as being wicked & unreasonable men not having faith and no longer walking after the tradition taught of us as given in 2 Thessalonians 2:13-15 and thus become disorderly as many fall backwards and go into confusion which God is not the author of ( 1 Corinthians 14:32-33 )in these movements of the "spirit" when seeking to receive the "Holy Spirit" after a sign apart from salvation... BUT they are still His as we are commanded to withdraw from those who refuse to repent to admonish them not as the enemy, but as brothers still ( 2 Thessalonians 3:1-7,14-15 ), just as Jesus will excommunicate them unless they repent in time.
This is why the solution is to narrow the way back to the Son ( Luke 13:24-30 ) and keep your eyes on Him and not on what believers are claiming to be the Holy Spirit coming and going by a sign, because the real indwelling Holy Spirit & scripture are still pointing and warning believers to keep going to the Bridegroom in living this reconciled relationship with God and not out to the marketplace, seeking to be filled, and thus hardly waiting nor ready as filled since they were saved for the Bridegroom to come for the abiding bride of Christ.