The Greek word for devil is “Diabolos” and it shares the root word “diaballein” which means “to split”. The devil is a splitter, a divider, a wedge driver. He divided Adam and Eve in the garden from God and he would like to separate us from God too.
Read Ezekiel 28:12-18 (passage is about King of Tyre, God compares his to Satan and in the midst of prophesying to him, he speaks of Satan’s demise)…..Read Isiah 14:9-16, Luke 10:17-20, 1 Peter 5:8-9, John 10:10, John 12:31, Colossians 2:15, 2 Peter 2:4, Jude 6.
Then read the Promises of God from Scripture to Stand upon regarding Satan: Romans 16:20, 1 John 4:4, 1 Cor. 10:13, John 4:7, Revelation 12:12
Satan appears in the garden at the beginning and he is cast into the lake of fire at the end. Revelation 20:10, See also 2 Corinthians 10:3-4.