For we do not wrestle against flesh and blood, but against principalities, against powers, against the rulers of the darkness of this age, against spiritual hosts of wickedness in the heavenly places.

Ephesians 6:12 New King James Version

In Acts of the Apostles, Luke tells us Paul has had many opportunities to stand before the leading political figures of his days. Yet you will notice that he never once speaks of state affairs or public issues to them except the gospel of Jesus Christ. It doesn't mean he doesn't care about the extreme inequality of wealth and social status that existed in his time. Rather Paul chose to take the conversation to a whole different level.

In his preaching and writings, Paul exposes the spiritual forces of evil that keeps humanity oppressed and enslaved. We are not fighting human foes but against spiritual enemies working to steal, kill and destroy the wholeness and beauty of God's creation, which He calls good.

Let me give you an example. 

While most laws serve to respect, protect and uphold human dignity and human rights, there are hints of dark overtures in certain laws. They are evil and blind to the plight of human suffering and injustice. They are unjustly created to increase the might of those who made the laws by robbing the strength of those who are subjected to their laws. Laws that justify racial killings and ethnic cleansings are inhuman, but worst still are the laws that protect the guilty from answering to their crimes and misdeeds. 

We, however, are on the winning side of this spiritual warfare. The finished work of the Cross has already demolished the power of dark spiritual forces (cf. Colossians 2:15) and our calling is to enforce the victory Jesus won for humanity at the cross. 

The implication is huge. 

Though the Kingdom of God is not political, it has something to say about our secular systems and structures. Instead of cowering away into the four walls of a church building, Christians have political responsibility and obligation. We are to raise our voices to pray for our national leaders and government (1 Timothy 2:2) that God opens their eyes to the gospel, and we are to lend our voices to the cries of injustice and violation of rights because of the gospel (Luke 4:18-19). In doing so, we fulfil both our spiritual and civil duties.