A question I have often asked is when, precisely, did Satan become the God of this system of things?
The Old Testament does not mention Satan as world ruler. There are vague references in Daniel where demonic princes are in charge of various parts of the world, even wrestling with the angel Gabriel to prevent him from giving Daniel a message.
I would have though that after the Flood of Noah's Day, it was time for a fresh start, but God allowed Satan to take up his former role.
A number of scriptures in the New Testament suggest that Satan was already God of this world.
John 12:31: "Now is the time for judgment on this world; now the prince of this world will be driven out."
This seems to imply that Satan's ouster as prince of this world was IMMINENT at the time it was written.
John 14:30: "I will not speak with you much longer, for the prince of this world is coming. He has no hold on me."
What does this mean, "the prince of this world is coming?"
2 Corinthians 4: "the god of this system of things has blinded the minds of the unbelievers, that the illumination of the glorious good news about the Christ, who is the image of God, might not shine through"