2 Corinthians 4:4
In their case the god of this world has blinded the minds of the unbelievers, to keep them from seeing the light of the gospel of the glory of Christ, who is the image of God.

God’s Kingdom and Satan’s kingdom stand in direct opposition to one another. Satan’s throne is in the hearts of unbelievers. Much of the world serves Satan, and in their love of sin, they follow him.

Every human being is either a servant of God or a servant of Satan. Spiritually speaking, our father is either God or Satan. (See John 8:44)

“Satan’s kingdom is a powerful kingdom. His forces are formidable and are designed against God and man.”

-William Gurnall