This verse explains that:
He seized the dragon, that ancient serpent, who is the devil, or Satan, and bound him for a thousand years. (Rev. 20:2)
This is consistent with the Devil being the 'accuser of our brothers':
And the great dragon was hurled down—that ancient serpent called the devil and Satan, the deceiver of the whole world. He was hurled to the earth, and his angels with him. And I heard a loud voice in heaven, saying: “Now have come the salvation and the power and the kingdom of our God, and the authority of His Christ. For the accuser of our brothers has been thrown down, he who accuses them day and night before our God. (Rev. 12:9-10)
It is rather disconcerting that after such a rebellion the Devil makes his way back into the heavenly courts. But that is the New Testament witness and confirmed in the Old Testament, especially with regards to Job.
When the Apostle John wrote the Gospel according to John he was probably the pastor at Ephesus. All the rationalizations about John's authorship are modern phenomenon, rarely based on anything substantive.
The authorship of John is hardly something I have seen serious questions about, the church knows it's own sacred writings. They have been in the custody of a living witness their entire history as have the OT Hebrew writings.
By my count there are 17 references to Satan in the synoptic Gospels and only one in John.
From Vine's Dictionary of the New Testament:
In the NT the word is always used of "Satan," the adversary
- of God and Christ, e.g., Matthew 4:10; 12:26; Mark 1:13; 3:23, 26; 4:15; Luke 4:8 (in some mss.); 11:18; 22:3; John 13:27;
- of His people, e.g., Luke 22:31; Acts 5:3; Romans 16:20; 1Corinthians 5:5; 7:5; 2Cr 2:11; 11:14; 12:7; 1Th 2:18; 1Ti 1:20; 5:15; Rev 2:9, 13 (twice), 24; 3:9;
- of mankind, Luke 13:16; Acts 26:18; 2 Thessolnians 2:9; Rev 12:9; 20:7.
His doom, sealed at the Cross is foretold in its stages in Luke 10:18; Rev 20:2, 10. Believers are assured of victory over him, Romans 16:20. The appellation was given by the Lord to Peter, as a "Satan-like" man, on the occasion when he endeavored to dissuade Him from death, Matthew 16:23; Mark 8:33.
"Satan" is not simply the personification of evil influences in the heart, for he tempted Christ, in whose heart no evil thought could ever have arisen (John 14:30, 2Corinthians 5:21; Hebrews 4:15); moreover his personality is asserted in both the OT and the NT, and especially in the latter, whereas if the OT language was intended to be figurative, the NT would have made this evident. (see
G4567 Σατανᾶς Satanas)
Let's take this into perspective, Jesus speaks often of the Devil/Satan, there are extensive quotes and not just in John:
Satan: Is there really a Devil? Some chose to ignore the reality that there is a literal Devil who seeks to devour and destroy. The language of Jesus certainly indicates His own belief in the Devil’s existence.
Jesus said a good deal about Satan. He called him:
"the enemy", Matthew 13:39.
"The evil one", Matthew 13:38
"The prince of this world", John 12:31; 14:30
"A liar", and "the father of lies", John 8:44.
"A murderer", John 8:44.
He said that he "saw him fallen from heaven", Luke 10:18.
That he has a "kingdom", Matthew 12:26.
That "evil men are his sons", Matthew 13:38.
That he "sowed tares among the wheat", Matthew 13:38,39.
He "snatches Word from hearers", Matthew 13:19; Mark 4:15; Luke 8:12.
The he "bound a woman for 18 years", Luke 13:16.
That he "desired to have Peter", Luke 22:31.
That the has "angels", Matthew 25:41.
That "eternal fire is prepared for him", Matthew 25:41
The Bible represents Satan as:
"The tempter", Matthew 4:3
"The prince of demons", Matthew 12:24; Mark 3:22; Luke 11:15.
"Source of demoniacal possession", Matthew 12:22-29; Luke 11:14-23
That he put the betrayal into the heart of Judas, Jn 13:2,27.
That he perverts the Scripture, Matthew 4:4; Luke 4: 10,11
That he is "the god of this world", 11 Cor. 4:4.
That he is "the prince of the power of the air", Ephesians 2:2
That he "fashions himself into an angel of light", 11 Cor. 11:14.
That he is our "adversary", 1 Peter 5:8.
He is "the deceiver of the whole world", Rev. 12:9; 20: 3,8,10.
Calls him "the great dragon", "the old serpent", Revelation 12:9; 20:2.
The "seducer of Adam and Eve", Genesis 3:1-20.
That he will "flee if resisted", James 4:7.
That he caused "Paul's thorn in the flesh", 11 Cor. 12:7.
Hindered Paul's missionary plans, 1 Thess. 2:18.
Caused Ananias to lie, Acts 5:3.
That Gentiles are under his power, Acts 26:18.
That he blinds the minds of unbelievers, 11 Cor. 4:4.
False teachers are "a synagogue of Satan", Rev. 2:9; 3:9.
Can produce false miracles, 11 Thes. 2:9.
Is the moving spirit of the ''Apostasy'', 11 Thes. 2:9
As a roaring lion seeks to devour Christians, 1 Peter 5:8
Is overcome by faith, 1 Peter 5:9.
Is wiley, Ephesians 6:11.
Is the spirit that works in the disobedient, Ephesians 2:2
Moved David to sin, I Chron. 21:1.
Caused Job's troubles, Job 1:7-2:10.
Was the Adversary of Joshua, Zech. 3:1-9.
Gets the advantage of Christians, 11 Cor. 2:11.
Evil men are his children, 1 John 3:8,10. ((Halley's Bible Handbook)
That's just to give you an idea of how often Satan is mentioned in Scripture, I think you've gotten some bad information. Give the source material a once over and we can talk some more.
Grace and peace,
Mark