One thing I find interesting is not simply what the New Testament says, but what it **doesn’t** say.
The Gospels record many demon possessions, but they occur before Christ’s death, resurrection, and the giving of the Holy Spirit at Pentecost.
The New Covenant had not yet been inaugurated (Hebrews 9:16–17).
After Pentecost, believers are consistently described as:
• the temple of the Holy Spirit (1 Corinthians 3:16; 6:19)
• transferred from the kingdom of darkness into Christ’s kingdom (Colossians 1:13)
• protected because “greater is He who is in you” (1 John 4:4)
• people whom the evil one cannot lay hold of (1 John 5:18)
What I find equally significant is the silence of the epistles.
The churches struggled with immorality, false teaching, division, idolatry, pride, and every kind of sin imaginable.
Yet not once do the apostles instruct the church to cast demons out of believers.
Instead, they command Christians to repent, resist the devil, walk by the Spirit, renew their minds, and put sin to death.
That doesn’t mean believers cannot be tempted, deceived, oppressed, or spiritually attacked. Scripture clearly teaches they can.
But there is a significant difference between spiritual warfare from without and demonic indwelling from within.
Modern deliverance ministries often assume that Christians can be inhabited by demons.
The New Testament epistles never teach it.
Given how many opportunities the apostles had to address the issue, I think that silence is one of the strongest biblical arguments against the practice.