Sounds kinda weird doesn't it? Well I thought that too the first time I heard it. Most people are fine with the spiritual part but its the warfare that throws them. I will admit that it can sound a bit "out there" but it is biblicaly sound doctrine. Paul wrote about it in Ephesians 6:12: "For our struggle is not against flesh and blood, but against the rulers, against the authorities, against the powers of this dark world and against the spiritual forces of evil in the heavenly realms." Satan doesn't want us to have a personal relationship with God. He wants us to embrace our sin nature and rebel against God. Satan is the father of lies (John 8:44) and one of his biggest lies to the world is that he, and his minions, are not active.
There is a line from the movie "The Usual Suspects" that goes like this: "The greatest trick the Devil ever pulled was convincing the world he didn't exist.". I think that if you would ask most people they would probably say that the Devil or Satan is just a concept and not an actual being. If we don't think he is really there then how can we resist him if he entices us? Satan loves to whisper lies to us. He knows what buttons to push to get us to believe those lies too. In the Bible we are instructed to "take captive every thought" ( 2 Corinthians 10:5 ) and "See to it that no one takes you captive through hollow and deceptive philosophy" ( Colossians 2:8). Did you know not every thought that comes into your head comes from you? Some thoughts come from outside influences like your spouse, friends, or the people you work with. Some thoughts come from God through the Holy Spirit. Other thoughts come from Satan. Keeping all of this in mind we also must remember that in the end we are responsible for our own actions. God has given us the ability to choose. We can choose to follow God and live in the truth of the Spirit or to believe the lies. We can't push the blame of our sins off on to society, Satan, or other people.
So all of this begs the question: How can I, a normal human, sort all of this supernatural stuff out? Well for starters we can pray and read the Bible. If you are active in a church you can talk to your pastor about these issues. Also if your are currently involved in a small group study you can discuss this there too.
Below I have listed some resource scripture that deals with this issue.
2 Corinthians 10:3-6For though we live in the world, we do not wage war as the world does. The weapons we fight with are not the weapons of the world. On the contrary, they have divine power to demolish strongholds. We demolish arguments and every pretension that sets itself up against the knowledge of God, and we take captive every thought to make it obedient to Christ. And we will be ready to punish every act of disobedience, once your obedience is complete.
Colossians 2:6-10 So then, just as you received Christ Jesus as Lord, continue to live in him, rooted and built up in him, strengthened in the faith as you were taught, and overflowing with thankfulness. See to it that no one takes you captive through hollow and deceptive philosophy, which depends on human tradition and the basic principles of this world rather than on Christ. For in Christ all the fullness of the Deity lives in bodily form, and you have been given fullness in Christ, who is the head over every power and authority.
Ephesians 6:10-18Finally, be strong in the Lord and in his mighty power. Put on the full armor of God so that you can take your stand against the devil's schemes. For our struggle is not against flesh and blood, but against the rulers, against the authorities, against the powers of this dark world and against the spiritual forces of evil in the heavenly realms. Therefore put on the full armor of God, so that when the day of evil comes, you may be able to stand your ground, and after you have done everything, to stand. Stand firm then, with the belt of truth buckled around your waist, with the breastplate of righteousness in place, and with your feet fitted with the readiness that comes from the gospel of peace. In addition to all this, take up the shield of faith, with which you can extinguish all the flaming arrows of the evil one. Take the helmet of salvation and the sword of the Spirit, which is the word of God. And pray in the Spirit on all occasions with all kinds of prayers and requests. With this in mind, be alert and always keep on praying for all the saints.
Galatians 5:16-26So I say, live by the Spirit, and you will not gratify the desires of the sinful nature. For the sinful nature desires what is contrary to the Spirit, and the Spirit what is contrary to the sinful nature. They are in conflict with each other, so that you do not do what you want. But if you are led by the Spirit, you are not under law.
The acts of the sinful nature are obvious: sexual immorality, impurity and debauchery; idolatry and witchcraft; hatred, discord, jealousy, fits of rage, selfish ambition, dissensions, factions and envy; drunkenness, orgies, and the like. I warn you, as I did before, that those who live like this will not inherit the kingdom of God.
But the fruit of the Spirit is love, joy, peace, patience, kindness, goodness, faithfulness, gentleness and self-control. Against such things there is no law. Those who belong to Christ Jesus have crucified the sinful nature with its passions and desires. Since we live by the Spirit, let us keep in step with the Spirit. Let us not become conceited, provoking and envying each other.