Exorcism

 Exorcism was practiced by various people in the gospels and the book of Acts. The disciples in (Matthew 10); others using Christs' name (Mark 8:38); the children of the Pharisees (Luke 11:18-19); Paul in (Acts 16); and certain exorcists (Acts 19:11-16). It seems that the purpose in Jesus's disciples performing exorcisms was to show Christ's dominion over the demons (Luke 10:17) and to verify that the disciples were acting in His bane by His authority. Also, it revealed their faith or lack of (Matthew 17:14-21). Miracles can be counterfeited (2 Thessalonians 2:9). Jesus said that some who are not truly His may still perform miraculous signs- including exorcisms- in His name. 

Romans-Jude also known as teaching portions of the New Testament refer to demonic activity but dues discuss casting them out nor does it exhort us to. We are told to put on the armor to stand against it (Ephesians 6:10-18).  Were told to resist the devil (James 4:7), to be careful of him (1 Peter 5:8), and bot to make room for him in our lives (Ephesians 4:27). We are not told how to cast the devil or his demons out of others or that we should even consider doing that. 

 As the Word of God was completed Christians had more weapons to battle the spirit world than did the early Christians. Casting out demons was replaced, for the most part, with evangelism and discipleship through God's Word. Since the methods of spiritual warfare in the New Testament do not involve casting out demons, it is difficult on how to do such a thing, or whether it is even necessary to do it.  It seems that it through exposing the individual to the truth of the Word of God and Jesus Christ.

Sources:https://www.gotquestions.org/Christian-exorcism.html

https://www.gotquestions.org/Catholic-exorcisms.html