So Satan was bound at the cross was he? And he's not loose now? That's not true, Satan with the evil spirits that follow him are loose and in the hearts of those who do evil. Jesus says that he''s the prince of this world so he's very much free in this world.
Jesus said this
John 14
Hereafter I will not talk much with you: for the prince of this world cometh, and hath nothing in me.
It was Satan who murdered Jesus through wicked men, it it is Satan who is the prince of this world. This is why Jesus said the following (below in Luke 22) because those who were handing him over to be murdered were full of darkness and had Satan in their hearts, and they were in darkness because they were blinded by the God and Prince of this world, Satan, who causes darkness. We are blind when we are in the dark and we are in the dark when we are in the flesh. Because it's Satan who the world is under the will of, and they follow him by the lusts of their flesh, loving their flesh and this world, until they have the chance to see the light when they hear the gospel of God and believe the truth and turn from sin.
Luke 22
When I was daily with you in the temple, ye stretched forth no hands against me: but this is your hour, and the power of darkness.
And according to Paul, Satan is very much free!
Acts 26
Delivering thee from the people, and from the Gentiles, unto whom now I send thee, To open their eyes, and to turn them from darkness to light, and from the power of Satan unto God, that they may receive forgiveness of sins, and inheritance among them which are sanctified by faith that is in me.
2 Corinthians 11
For such are false apostles, deceitful workers, transforming themselves into the apostles of Christ. And no marvel; for Satan himself is transformed into an angel of light. Therefore it is no great thing if his ministers also be transformed as the ministers of righteousness; whose end shall be according to their works
1 Timothy 1
Holding faith, and a good conscience; which some having put away concerning faith have made shipwreck: Of whom is Hymenaeus and Alexander; whom I have delivered unto Satan, that they may learn not to blaspheme.
2 Corinthians 2
Forgive also: for if I forgave any thing, to whom I forgave it, for your sakes forgave I it in the person of Christ;
Lest Satan should get an advantage of us: for we are not ignorant of his devices.
1 Corinthians 5
For I verily, as absent in body, but present in spirit, have judged already, as though I were present, concerning him that hath so done this deed, In the name of our Lord Jesus Christ, when ye are gathered together, and my spirit, with the power of our Lord Jesus Christ,To deliver such an one unto Satan for the destruction of the flesh, that the spirit may be saved in the day of the Lord Jesus.
1 Corinthians 7
Defraud ye not one the other, except it be with consent for a time, that ye may give yourselves to fasting and prayer; and come together again, that Satan tempt you not for your incontinency.
2 Thessalonians 2
Even him, whose coming is after the working of Satan with all power and signs and lying wonders, And with all deceivableness of unrighteousness in them that perish; because they received not the love of the truth, that they might be saved.
And here's Peter
Acts 5
Then Peter said, “Ananias, how is it that Satan has so filled your heart that you have lied to the Holy Spirit and have kept for yourself some of the money you received for the land?
And these next verses sum it all up
Romans 16
For they that are such serve not our Lord Jesus Christ, but their own belly; and by good words and fair speeches deceive the hearts of the simple. For your obedience is come abroad unto all men. I am glad therefore on your behalf: but yet I would have you wise unto that which is good, and simple concerning evil. And the God of peace shall bruise Satan under your feet shortly. The grace of our Lord Jesus Christ be with you. Amen.