The devil is a splitter, a divider, a wedge driver. He divided Adam and Eve from God in the garden. He would like to separate you from God as well. He wants to take all unbelievers to hell and make life hell for believers.
Our weapons are prayer and worship and Scripture. When we pray, we engage the power of God against the devil. When we worship, we do what Satan himself did not do: we place God on the throne. And when we pick up the sword of Scripture, we proclaim truth.
According to Colossians 2:15, “Having disarmed the powers and authorities, [Jesus] made a public spectacle of [the forces of evil], triumphing over them by the cross.” Satan will not linger long where God is praised and prayers are offered. Satan may be vicious, but he will not be victorious. God has already won.