Church and mission 11/4-The separation of church and kingdom

In class we learned that one of the reasons why people have done so many ungodly things in the name of Christ is because they did not separate the church from the kingdom of God. So the church became the enforcer of God's will on people without any checks or balances. I believe this is always a danger when the church aligns itself with a political system or culture. Then that political system or culture begins to be identified with the kingdom of God and begins to be imposed on those who do not adhere to it. So what can we do to stop the alignment of church and kingdom and the alignment of church and state?