Satan is not "in charge" but he has Dominion in the hearts of many. Hard for me to really explain on a smart phone. The "world" he "rules" is using a language style the the Hebrews of Christ time would have understood differently. They considered "the world" to be encompassing only their surroundings and the religious systems they had established. By Christ's time, Judaism had degenerated into systems of tyranny, all of which were not in line with the kingdom of God.
Christianity has developed the same failings. Running the gambit from money changers to resurrection denier's. Most "theology" in the past 200 years is utter bullshit. Sure, the Catholic church has been apostate for centuries, but so are most modern churches, especially the Zionist knuckleheads.
Just don't throw out the baby with the bathwater...
Like everything else worth while, it takes time and work to understand.
The sign of Jonah... Christ was in the tomb for 3 days.
Already happened.