Satan was created a perfect angelic being (Ezekiel 28:15). He rebelled against God (Ezekiel 28:15-18; Isaiah 14: 12-17). As a result, he became completely depraved and the leader of the host of angels who fell with him, and the adversary of God and God’s people (Revelation 12:4, 10-17; Revelation 13:7; 2 Corinthians 11:13-15).
Satan has been defeated and judged at the Cross. He now awaits his ultimate doom at the second advent of Jesus Christ (John 16:11; Revelation 20:1-2, 7-10).