2 Corinthians 10:3-5

3 "For though we live in the world, we do not wage war as the world does.
4 The weapons we fight with are not the weapons of the world. On the contrary, they have divine power to demolish strongholds.
5 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."

Satan's primary weapons are the deceptions and false ideas that undermine the True Knowledge of God and His Word! If Satan can get us to doubt God or have a wrong understanding of God, his task of deceiving us is made easier. That is why it is imperative for us to be alert in our minds, and to demolish every false idea and thought that enters our mind and make them obedient to Christ! Our primary weapon is God's Word, and unless you read, study, understand and obey Its Truths, you will be continuously vulnerable to Satan's attacks!