I think it should control politics for pragmatic reasons. North Korea is a perfect example of what happens when Christian theology has no control of a country’s politics. The leadership of North Korea is afraid of Christianity because it represents a danger to the ruling elites control of that country. Christians are routinely murdered for their religion in North Korea. The former Soviet Union had similar deficiencies and this type of cruel repression seems common in countries guided by atheistic human centered philosophy. Some misguided liberal atheists in the United States that I have talked with want to eliminate any input from Christian theology in American politics. They believe that Christians should keep their Christianity in the closet and let them decide how to run the country. The end result of this pattern would be similar to the old Soviet Union in my opinion.
Christian theology played a pivotal role in the early development of United States government and laws because the vast bulk of the people living here were Christians and most of the founding fathers had a strong Christian influence. There was no state religion established and minority non-Christian religions were given more protection than in most european countries of the time. Evils contrary to Christian theology such as slavery and persecution of minorities existed and to a lesser extent still exist today which is another practical reason for Christians to influence politics based on their beliefs.
On a personal level, I don’t want to be killed for my faith when there are ways to prevent it from happening. Christians should make the attempt to interject their faith in our politics whenever possible to avoid groups similar to Nazi’s, Atheistic Communists, Boko Haram and ISIS from undermining our public institutions such as government. Just because you think it will never happen in the United States of America doesn’t mean it won’t happen. Some day it may be necessary to die on the spot if you say you are a Christian in the USA. People said that Trump would never be chosen as the nominee of the Republican party. Guess what? It happened.
If Christians follow the words of Jesus they can only have a positive effect on our country’s government and its adherence to good morals and ethics.