There are some things that you need to know about the devil and demons.  
 
Who is the devil?
The devil was originally an angel. (Ezekiel 28:12-15)
Lucifer (“light-bearer”) – possibly His original angelic name before he fell. (Isaiah 14:13)
Satan – Hebrew  for “adversary or opponent”
Devil – Greek for “slanderer or accuser”  
 
4 Things to Know About the Devil:
1. The world is under the influence of the devil. 
1 John 5:19 - “the world is under the control of the evil one”
John 12:31 – “prince [ruler] of the word”
Ephesians 2:2 – “the prince of the power of the air” 
 
2. The devil’s weapons are deception, accusation, and temptation. 
2 Cor. 11:4;Rev. 12:10; 1 Thessalonians 3:5; John 8:44
 
3. He has already been defeated.
Colossians 2:15; Luke 10:18.
Satan can only do to you what you give him permission to do to you.
 
4. Resist him and he will leave. 
James 4:7; Ephesians 4:27.
 
What are demons?
Demons, also called unclean or evil spirits in scripture, are created supernatural beings that used to be angels that willfully followed Lucifer during his rebellion.
 
Revelation 12:3-4,9; Ephesians 6:12
 
What do demons do?
1. Cause sickness, physical disability, and mental illness. Mark 9:17-29 - the boy with seizures/epilepsy; Luke 13:11-13; Luke 8:27-35
 
2. Spread false theology. 
1 Timothy 4:1 
 
3. Try to convince us to sin. 
James 3:15
 
4. Represent false gods. 
1 Corinthians 10:20
 
5. Assist people in witchcraft and the occult. Acts 16:16
 
6. Stop the advance of the Kingdom of God. 
Daniel 10:13
 
3 Things to Know About Demons:
1. Unbelievers can be possessed by demons.
Mark 5:2-5
 
2. Believers can be oppressed by demons. 
Matt. 16:23“get behind me Satan”
Acts 10:38“…healing all who were oppressed by the devil.”
 
3. Believers can cast out demons in the name of Jesus. 
Luke 10:17; Mark 16:17
 
Do you have a biblical perspective on the devil and demons?