A correct understanding of spiritual warfare is to focus on Christ and not the power the enemy. Satan has no rightful authority over the born-again child of God.

The battle has already been won at the Cross! Spiritual warfare for the believer is applying and reinforcing the victory of the cross upon the enemy.

God and the devil are not equal in power struggling for the souls of man. No, God is infinitely, transcending, greater than his creation, who is satan. God does not coexist with the devil. The powers of darkness were conquered and disarmed at the cross, God made a public spectacle of them, tromping over them in the cross of Christ.

Having despoiled principalities and powers of Christ, by his death and resurrection took away their power the Lord over true believers, having conquered all the principalities and powers in the undermanned state for Christ for followers. (John 12:31; 16:11) and God made a public spectacle an example of. He led them as captives, after the man manner of ancient conquest conquers. Showing all the spiritual realms they are defeated and Jesus Christ is Lord in heaven and on earth and under the earth. (Ephesians 4:8)

None of the rulers of this age or world perceived and recognized and understood the eternal and timeless purpose which God has realized and carried into effect in the person of Christ Jesus our Lord, (Ephesians ‭3:11)‬ ‭for if they had, they would never have crucified the Lord of glory. (1 Corinthians‬ ‭2:8‬)

For God disarmed the principalities and powers that were ranged against us and made a bold display and public example of them, in triumphing over them in Christ Jesus and in the cross. (Colossians ‭2:15‬)

The Father has delivered and drawn you to Himself out of the control and the dominion of darkness and has transferred us into the kingdom of the Son of His love, In Whom you have your redemption through His blood, which means the forgiveness of our sins. (Colossians ‭1:13-14‬).

Christ has reconciled you to God in the body of His flesh through death, in order to present you holy and faultless and irreproachable in the Father's Presence.
‭‭(Colossians‬ ‭1:22‬)‬

The sacrifice of Christ on the cross is much much more than just the forgiveness of sins. It's the ultimate example of unconditional love, waged on a cosmic spiritual realm, culminating in Satan's hatred for Jesus.

Satan tried killing Jesus at his birth through Herod. Tempted Jesus in the wilderness to fall away from the father's plan. He said before the word of God himself his words which he had spoken and Satan was defeated with three simple words it is written.

The One who had spoken the word Satan used is the One who responded to the word spoken to him with the word of God, God Himself. He tempted Jesus body, His soul, His spirit, and Jesus defeated him with the Word of God.

Now This Same Word of God Lives in. It is No Longer You Who Lives but Christ That Lives in You, the Word of God.

Make no mistake, one of the clear purposes of Jesus coming in the World is to Do Battle with Satan. He Left Heaven and Invaded Satan's Sphere. He was unwelcomed by His own and hated by Satan.

“He came into the world, and though the world was made through Him, the world did not recognize Him [did not know Him]. He came to that which belonged to Him and they who were His own did not receive Him and did not welcome Him.” (John ‭1:10-11‬)

Jesus in His inaugural address of his ministry at the synagogue in Nazareth publicly prclaimed His marching orders from the Father from thenWord He had give Isaiah to speak concerning Him in Isaiah 61:1

Jesus Christ is Lord!