Not that Pentecostals don't love Jesus and desire to keep their doctrine true. But unless they test all teachings by the Word of God and recognize that experience must be secondary to truth, deception has an open door. Satan's ministers will preach righteousness, morality, and family life. They will preach against pornography, crime, homosexuality, abortion, and the corruption of the world system. While these are legitimate issues of vital importance, they are irrelevant in determining whether the voice is from God or from Satan.
Many cults stress righteousness and morality.
The only means we have to test the spirits is rightly dividing the Word of Truth. Even the preaching of Christ crucified and resurrected is no longer a means of determining if the spirit speaking is of God or Satan. Mormons believe in the Lord's bodily Resurrection. They and Jehovah's Witnesses testify that they are saved by grace through faith in the Lord Jesus Christ. But these declarations are nullified by deeper teachings to which adherents are gradually indoctrinated.