Why is the kingdom of God not of this world?

Jesus stated in John 18:36 that His kingdom is not of this world, indicating that the mission of His followers is not to engage in worldly conflicts but to promote spiritual truth and righteousness. The kingdom of God operates apart from earthly principles and is built upon spiritual warfare, as stated in Ephesians 6:12, where we wrestle against spiritual wickedness. This distinction is crucial for Christians to understand, as it helps ensure our allegiance remains with Christ over worldly powers.