THERE is no such thing as a "Christian politics." If it is a politics, it cannot be Christian.
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The Romans did not believe Jesus when he said he had no political ambitions. That is why the soldiers mocked him as a failed king, giving him a robe and scepter and bowing in fake obedience (John 19:1-3). Those who today say that they are creating or following a "Christian politics" continue the work of those soldiers, disregarding the words of Jesus that his reign is not of this order.
Some people want to display and honor the Ten Commandments as a political commitment enjoined by the religion of Jesus. That very act is a violation of the First and Second Commandments. By erecting a false religion — imposing a reign of Jesus in this order — they are worshiping a false god. They commit idolatry. They also take the Lord's name in vain.
It will, of course, be ignored by everyone on both sides.