Consider this in your search. Earth has been a battleground between good and evil since the garden where man walked and talked with God his Creator only to fall from grace.  Today you are seeing a world of evil and yes satan can go as he wishes.  Unlike God satan can only be in one place at a time.  He uses his demons and other fallen angels to cause the problems you are a witness to. People like Soros and Hillary do his bidding.   God also uses people to wage the war against evil like President Trump.    There are countless stories in the bible of God doing just that.  To those that put their faith in Jesus Christ, not only your eternal address changed from a place known as hell to a place called heaven. It was a day in which you passed from darkness to light, a day in which you found new purpose and meaning. He can do nothing in the life of the Christian without God's permission. You can be oppressed to some degree, but if you are a Christian, neither the devil nor a demon can ever take control of your life. When you placed your faith in Jesus Christ, you came under His protection.  Having said that, it doesn't mean the devil can't try to lure you out of God's protection and draw you into his web of deception. That's why, as a child of God, your objective should be to stay as close to the Lord as you possibly can-and keep as much distance between yourself and the devil as possible. On more than one occasion, the Scriptures refer to Satan as an accuser. Revelation 12:10 calls him "the accuser of our brethren who accused them before God day and night...". The difference between Satan's accusations and the Holy Spirit's conviction is that Satan will always drive you from the cross. Jesus always will bring you to it.