We are not given a detailed account in the Bible of satans origin but we do know that satan was one of God's angels created by Him to carry out His will.
At some point in time this angelic creature was in an unfallen sinless state and in one accord with God along with the rest of creation. This angel then chose to rebel against God due to pride and selfish ambition and when he rebelled he took a number of angels with him. When this happened he lost his favoured position that he had with God and became satan or the 'adversary'. He is not God's counterpart, because God has no equal, no opposite. God has always existed, and everything else that exists now, including angels, were created by God.
We see in Genesis 3 the first account of satan in action but before we look at this account, its important to recognise and realise here what God said about man in genesis 1:26-28, that man shall have dominion over every living thing that moves on the earth. Satan knew this and he knew that this is the only way that he could come against God by manipulating and deceiving man. He knows that his only power is by using man to carry out his deeds. So we look at Genesis 3:1-6 in the garden of Eden where satan takes the form of a serpent to deceive and tempt adam and eve to sin. His temptation succeeded as they took the apple off the tree, and sin entered the previously perfect world.
Satan, or the Devil, is described as many other different names in the Bible which all build a picture of his evil character. The main characteristics we read about this creature are his hostility, cunning, power, and evil intent toward God and His people.
He is described as; lucifer (Isaiah 14:12), son of the morning (Isaiah 14:12), day-star (Isaiah 14:12), the anointed cherub (Ezekiel 28:14), tempter (Matthew 4:3), accuser (Revelation 12:10), liar and the father of lies (John 8:44), enemy (Matthew 13:39), adversary (1 Peter 5:8), evil one (Matthew 13:19), murderer (John 8:44), ruler of this world (John 14:30), ruler of the kingdom of the air (Ephesians 2:2), god of this age (2 Corinthians 4:4), deceiver of the whole world (Revelation 12:9), old serpent (Revelation 12:9), dragon (Revelation 12:9), roaring lion (1 Peter 5:8), ruler of the demons (Matthew 9:34), beelzebub (Matthew 12:24), angel of light (2 Corinthians 11:14), belial (2 Corinthians 16:15).
So we can now understand the true character of satan, or the devil. He was a created angel who was perfect in all his ways who decided to rebel against God. In doing so he used man to bring sin into the universe and he continues to use man leading them into darkness to fulfil his deeds.
Uncovering satan Series
Part 1: Who is satan?
Part 2: Satan cannot access our minds
Part 4: Temptation
Part 5: Conviction and Righteousness
Part 6: The conscience