What demons believe

“You believe that there is one God. Good! Even the demons believe that – and shudder.” James 2:19
Ask a number of people what they envisage demons to be like, and you might receive answers such as, little red imps with horns shaking their pitchforks in the face of God. But what does the Bible really tell us about them, and what they believe? Demons do not deny God’s existince, nor do they openly defy Him. Demons certainly believe in God (James 2:19). They also fear Him – which is more than can be said for most people walking around.
They also believe that Jesus is the Son of God. There are several instances in the Gospel accounts where Jesus cast out a demon, and when it shrieked, “You are the Son of God!” He told it to be quiet (see Mark 1:24-25, Mark 5:7, Luke 4:41, etc.). They believe in hell, as a place of eternal torment (see Matt. 8:28-29). In fact, hell was specifically created for the devil and his angels (Matt. 25:41). Satan himself knows the Bible and can quote Scripture (Matt. 4:5-6). Yet despite all these things, demons are not saved.
Believing that there is a God, or even believing in God, is not the same as having faith in God. Saving faith requires us to take action on that belief, and to entrust our lives to Him, knowing that as we do so, our sins are forgiven by the blood of Jesus Christ. Demons are unable to do this, having already sealed their eternal fate when they joined Satan in his rebellion against God in the beginning. Do you believe in God? Good. Have you put your trust in Him? Even better.