The saints who are apart of the Church (body of Christ) are the Holy of Holies. The Spirit of God indwells them, which no other group has had or will have this type of relationship with God, 1 Corinthians 3:16. The Holy of Holies of God has no agreement with idols – demons are behind the worship of sticks and stones, 2 Corinthians 6:16. Christ indwells those in the Church, Colossians 1:27. Therefore, no demon can enter this house (the flesh of a saint).
Satan (and his demons) is not permitted to touch a Christian. 1 John 5:18 We intuitively know that everyone born out from God does not habitually sin, and the malignantly evil one cannot touch him.
Satan can only ensnare a Christian to do his desirous will, 2 Timothy 2:24-26 …they should come to a right mind out from the snare of the Devil, having been captured alive by him for the purpose of that one’s desirous will; 1 Timothy 3:7.
This is not being demonized. One who is demonized is in fact possessed by a demon not just tormented. During the earthly ministry of Christ, He cast out the demons from those who were demonized, Matthew 8:16; 9:32, 33; Mark 1:32-34. We only see this type of activity during the time Jesus was walking the earth. After the Gospels, Scripture does not use this word; rather, it says they had a demon or spirit, Acts 16:16.
Although the Old Testament reveals the workings of demons among men, the concept of men being possessed is not used; rather, the evil spirits manipulate unsaved men, Judges 9:23; 1 Kings 22:23. Even within the Dispensation of Law, prior to the Son’s incarnation, we see that an evil spirit could only trouble one of God’s people, and this was only with God’s permission, 1 Samuel 16:14. Saul was not a Christian, because only those who are in the Church are called Christians, but he was a saved Jew under the Mosaic Law. Yet, even though Christians have more protection from demons now, this demon could not enter Saul; rather, it only troubled him.
Saints of the dispensation of Grace have been provided by God the means to overcome Satan through resisting the devil by using “The Faith” – the doctrine by which we have victory over Satan, 1 Peter 5:9.
The Armor from God, which is our defense against Satan’s attacks is found in Ephesians 6:10-18. Protecting the workings of our minds (girding up your loins) with truth (seeing things as they really are), 1 Peter 1:13; Recognizing that we are righteous before God because of Christ’s righteousness which is imputed to us (The breastplate of righteousness); Prepared to give an accurate presentation of the gospel pertaining to peace, which is how we are saved – Believing that Christ died for your sins, was buried, and rose again on the third day according to the Scripture, 1 Corinthians 15:1-4 (Feet bound in preparation of the Gospel of Peace); Understanding the security of your own salvation – by faith not works and cannot be lost (The helmet of salvation); Taking God at His Word (the Shield of Faith); Using the individual utterances of God by correctly using them to maintain your own mind on the things above (The Sword belonging to the Spirit).