Some men in the past held that Christians could not be part of the government or even have a say in its form or function. This view still lingers, perhaps out of habit more than conviction. Still, it is an issue we must address.
God ordained governments. He raises them up and puts them down (Dan. 4:25). They exist by His will to serve His will. There are times when God used a wicked nation to destroy another wicked one; Assyria annihilated Israel and Babylon devastated Judah.