The apostle John also wrote about spiritual warfare in his first epistle. Did he tell us to go up to the high places in order to tear down the devil’s strongholds? No. Did he tell us how to cast the demon of anger out of Christians who sometimes get angry? No.
Rather, John, like Peter and James, only believed in biblical, spiritual warfare, and so his instructions are the same:
Beloved, do not believe every spirit, but test the spirits to see whether they are from God; because many false prophets have gone out into the world. By this you know the Spirit of God: every spirit that confesses that Jesus Christ has come in the flesh is from God; and every spirit that does not confess Jesus is not from God; and this is the spirit of the antichrist, of which you have heard that it is coming, and now it is already in the world. You are from God, little children, and have overcome them; because greater is He who is in you than he who is in the world. They are from the world; therefore they speak as from the world, and the world listens to them. We are from God; he who knows God listens to us; he who is not from God does not listen to us. By this we know the spirit of truth and the spirit of error (1 John 4:1-6).
Notice that John’s entire discussion in these verses revolves around Satan’s lies and God’s truth. We are to test the spirits to see if they are from God, and the test is based on truth. Evil spirits will not admit that Jesus Christ came in the flesh. They are liars.
John also told us that we have overcome evil spirits. That is, as citizens of the kingdom of light, we are not under their dominion any longer. The greater one, Jesus, lives in us. People who have Christ living in them should not be afraid of demons.
John also said that the world listens to the evil spirits, which indicates that those evil spirits must be speaking. We know that they are not speaking audibly, but are planting lies in people’s minds.
As followers of Christ, we should not be listening to the lies of evil spirits, and John states that those who know God are listening to us, because we have the truth; we have God’s Word.
Again, notice that Satan’s strategy is to persuade people to believe his lies. Satan cannot defeat us if we know and believe the truth. That is what scriptural, spiritual warfare is all about.