First let us get a proper understanding of what is the anti Christ/Satan within the bible
John 4:1-3 [Beloved, do not believe every spirit, but test the spirits to see whether they are from God, for many false prophets have gone out into the world. By this you know the Spirit of God: every spirit that confesses that Jesus Christ has come in the flesh is from God, and every spirit that does not confess Jesus is not from God. This is the spirit of the antichrist, which you heard was coming and now is in the world already.]
1 John 5:9-10 [If we receive the testimony of men, the testimony of God is greater, for this is the testimony of God that he has borne concerning his Son. Whoever believes in the Son of God has the testimony in himself. Whoever does not believe God has made him a liar, because he has not believed in the testimony that God has borne concerning his Son. ]
What we are seen is that Christianity believe, the one they believe to be the one and only true god, is always correct and can't be wrong, thus, those who won't subject to him or present contradicting teaching, must be speak of lies and are demonic. So, if I say the earth is older then 5000 years old, in proper Christian view, I am a liar/demon.
Revelation 20:1-3 [Then I saw an angel coming down from heaven, holding in his hand the key to the bottomless pit and a great chain. And he seized the dragon, that ancient serpent, who is the devil and Satan, and bound him for a thousand years, and threw him into the pit, and shut it and sealed it over him, so that he might not deceive the nations any longer, until the thousand years were ended. After that he must be released for a little while.]
Satan is a metaphorical reference, to those who present teaching, that contradict Christ, including science, philosophy and other religion, so, here it is saying a time, where the rule of bible suppress all contradicting teaching for 1000 years, whether its science, religion or philosophy. It could be a reference to the dark ages, because the rule of the church began in 5th century, which saw suppression of all alternative views, including Roman Pagan gods, science and ancient Greek philosophy. 1000 years later, the age of enlightment allow the re emergence of alternative view and the church looses its power and with passing generation, alternative view become stronger and chuch's power get smaller and that is still going on, today.
Thus, what is so great about Satan? Without Satan there will be no age of Enlightment, no Industrial Revolution and the western world, would still be in the dark ages.
Romans 13:1-7 [Let every person be subject to the governing authorities. For there is no authority except from God, and those that exist have been instituted by God. Therefore whoever resists the authorities resists what God has appointed, and those who resist will incur judgment. For rulers are not a terror to good conduct, but to bad. Would you have no fear of the one who is in authority? Then do what is good, and you will receive his approval, for he is God's servant for your good. But if you do wrong, be afraid, for he does not bear the sword in vain. For he is the servant of God, an avenger who carries out God's wrath on the wrongdoer. Therefore one must be in subjection, not only to avoid God's wrath but also for the sake of conscience. ... ] So, without Satan there will be no democracy, because democratic elected leader are not appoint by Christ. Instead we shall still be su