Unclear if they were believers ... you cannot assume it ...
Thank you for your interest in the ministry of deliverance, that is, the casting out of demons/devils/evil spirits by the Lord Jesus Christ, the only begotten Son of God.
Forgive me, please, for having neglected a definitive verse.
Mark 16: 17 -
“14 ¶ Afterward he appeared unto the eleven as they sat at meat, and upbraided them with their unbelief and hardness of heart, because they believed not them which had seen him after he was risen. 15 And he said unto them, Go ye into all the world, and preach the gospel to every creature. 16 He that believeth and is baptized shall be saved; but he that believeth not shall be damned. 17 And these signs shall follow them that believe; In my name shall they cast out devils; they shall speak with new tongues; 18 They shall take up serpents; and if they drink any deadly thing, it shall not hurt them; they shall lay hands on the sick, and they shall recover.”
As you have indicated, you are not a New Testament believer, and so not a Christian, a believer in the Son of God, the Lord Jesus Christ of Nazareth.
27 But Jesus said unto her, Let the children first be filled: for it is not meet to take the children’s bread, and to cast it unto the dogs. 28 And she answered and said unto him, Yes, Lord: yet the dogs under the table eat of the children’s crumbs. 29 And he said unto her, For this saying go thy way; the devil is gone out of thy daughter.
According to this verse, deliverance is “bread for the children”, not for unbelievers.
It is however, evident that you need this ministry urgently. God bless you.