What are Satan and demons? (Q211)
From To Be A Christian, An Anglican Catechism
Demons, of whom Satan is chief, are fallen angels. Satan rebelled against God and led other angels to follow him. They now cause spiritual and sometimes physical harm to mortals, and they sow lies that lead to confusion, despair, sin and death. (Luke 11:14-26; 8:29; 9:39; John 8:44; 2 Corinthians 2:11; 2 Corinthians 4:3-4, 2 Corinthians 11:3; 2 Corinthians 12:7; Revelation 12:7-12)
