Jesus has authority over evil spirits
The Gospels leave no doubt that Jesus has authority over unclean spirits. In Capernaum, people were astonished because he commanded them and they obeyed. He also gave his disciples authority to confront evil spirits, showing that deliverance is rooted in his power, not in human strength or religious status (Mark 1:27; Mark 6:7).
That gives a starting point for this question. If someone is genuinely helped in Christ’s name, the help points first to Christ. It doesn't automatically settle every disagreement Christians may have about that person’s church, teaching, or practices.
And they were all amazed, insomuch that they questioned among themselves, saying, What thing is this? what new doctrine is this? for with authority commandeth he even the unclean spirits, and they do obey him.
A ministry result is not a full endorsement
Jesus’ disciples once saw someone driving out demons in his name who was not travelling with them. They tried to stop him, but Jesus told them not to, because the person was acting in his name and was not their enemy (Mark 9:38-40). That moment cautions us against assuming that God can only work through people who belong to our own group.
At the same time, Jesus did not teach that impressive spiritual acts prove a person knows him faithfully. He warned that some would point to mighty works while lacking a real relationship of obedience to him (Matthew 7:21-23). So an exorcism, or a report of one, cannot by itself verify all the doctrines of Catholicism, Protestantism, or any other Christian tradition.
The name of Jesus is not a formula
The book of Acts gives both hope and warning. Paul commanded an evil spirit to leave a suffering woman in the name of Jesus Christ, and it left (Acts 16:18). But the sons of Sceva tried to use Jesus’ name as a borrowed technique, without belonging to or submitting to him, and the result was disastrous (Acts 19:13-16).
So Christians should avoid treating exorcism as spectacle, magic, or proof of spiritual superiority. Jesus’ authority is real, but his name is not a phrase anyone can wield for their own purposes. The centre is trust in Christ, not confidence in a ceremony.
And this did she many days. But Paul, being grieved, turned and said to the spirit, I command thee in the name of Jesus Christ to come out of her. And he came out the same hour.
Test teaching carefully and charitably
The claim that “many Catholic beliefs are unbiblical” reflects real disagreements among Christians, especially about church authority, Mary, the sacraments, and salvation. Those disagreements deserve careful study, with open Bibles and a fair hearing, rather than being decided solely by stories of supernatural experiences.
John tells believers to test spiritual claims rather than believing every one of them (1 John 4:1-3). A wise response is to ask whether a teaching honours Jesus Christ, agrees with the apostolic gospel, and bears the fruit of truth and love. Read the passages in context, compare what is taught with Scripture, and keep Christ himself at the centre.
Beloved, believe not every spirit, but try the spirits whether they are of God: because many false prophets are gone out into the world. Hereby know ye the Spirit of God: Every spirit that confesseth that Jesus Christ is come in the flesh is of God: And every spirit that confesseth not that Jesus Christ is come in the flesh is not of God: and this is that spirit of antichrist, whereof ye have heard that it should come; and even now already is it in the world.