Politics concern is whether the presence of guns enhances human life or detracts from it. In a country becoming more and more diverse, not merely in terms of ethnic heritage but also religious, philosophical, and cultural perspectives as well, the cost to a nation of a morally focussed political structure is even greater. The moral minority may become oppressed by the majority who hold an equally legitimate but different moral standard. When Christians use the government to force their morals upon the non-Christian segment of the population, society loses, rather than gains. In such a case the Christian majority oppresses the non-Christian minority by forcing them to act according to a specific moral code despite the fact that an alternative moral code may in no way hinder the basics of human life.
Oppression is possible when government does more than ensure justice.
The plea to separate morality and justice is not an attempt to remove Christianity from politics. If justice is a requirement of politics and Christians, then logically, Christians must be involved in politics.