The Kingdom of God is the only kingdom or nation that is rightfully called Christian. The citizens of this kingdom are on earth, but their citizenship is in heaven. They do not treasure things that are highly esteemed in this world, which are an abomination to their heavenly King. Their treasure is in heaven, where they long to be when their earthly time and duties are done.
The values that govern their lives do not conform to the prevailing value system of the world, but their minds have been transformed by the work of the Holy Spirit so they understand the will of their heavenly King.
They are also citizens of the nation or kingdom where they live and are subject to all the laws of that kingdom or nation. They are loyal citizens and thankful for the benefits conferred by their earthly citizenship. But their first loyalty is to their heavenly King and His Kingdom.
It is folly for citizens of the kingdom of God to think an earthly kingdom can be a Christian nation. The principles of the kingdom of God don’t work in earthly nations because too many people follow the enemy of the heavenly King.
It is necessary for earthly kingdoms to use some measure of force to maintain order, sometimes lethal force. The kingdom of God is governed by the Holy Spirit working in the heart of those people whose hearts have been transformed to value peace and love above all other things. Those whose hearts are hardened and cannot hear the voice of the Holy Spirit must be governed by other means.
The heavenly King gives us the freedom to choose between good and evil, therefore He allows the enemy to work. There is a day coming when He will destroy the enemy and all earthly kingdoms; today He calls people the world over to come into His kingdom and find peace.
The methods of the enemy of God will never result in peace. When citizens of the heavenly kingdom take part in the government of an earthly kingdom, they must abandon some values of the heavenly kingdom. They will have more power to transform the world if they pray to their King and implore Him to overrule the plans of the enemy, to protect His people, and soften hard hearts.