As Christians we are seated far above all rule, authority and power (Eph 1:21). Satan is beneath our feet. He has been defeated. Our warfare is in our mind. We need minds renewed according to the word of God (Eph 4:23). The strongholds are thoughts, imaginations and wrong teachings that gets us to focus on our self, sin, the devil and what he is doing rather than the finished work of Jesus, the cross and ultimately Him. Our whole focus in Christianity is Christ.
Real spiritual warfare is acknowledging the truth about what God says about you. It is not about fighting devils. Real spiritual warfare is having a grace mentality not a law mentality. Real spiritual warfare is putting the flesh down and giving domination to your spirit man and having your mind renewed to the word of God.