The humanist / Cultural Marxist want Christians to stay out of politics as Christians. R2K agrees going so far as to insist that the Church as the Church has no word for public square politics. The humanists / Cultural Marxists deny that there is a valid Biblical word that applies to this public square. R2K agrees opting instead to appeal to a neutral common realm that is ruled by a wax nose Natural law. The humanists / Cultural Marxists argue that Old Testament laws, if applied today, would produce tyranny. R2K seemingly agrees and so in order to avoid the dastardly taint of “tyranny,” so called, can find it theoretically acceptable for Christians to support legislation creating space for civil unions. The humanists / Cultural Marxists say that the civil government should be run in terms of putatively religiously neutral laws. R2K agrees. The humanists / Cultural Marxists deny that the God of the Bible brings predictable sanctions in history against societies that do not obey His law. R2K agrees insisting that evil will never triumph over good apart from a cataclysmic in-breaking. The humanists / Cultural Marxists deny that the preaching of the gospel will ever fundamentally change the way the world operates. R2K agrees arguing, in a Manichean fashion, that good and evil will always grow together. The humanists / Cultural Marxists say that Christians should sit in the back of the cultural bus. R2K agrees just so long as they can be irrelevant on Sundays during worship time.
This is why both of these positions hate the message of Christian Reconstruction and both of these positions will make common cause to insure that biblical Christianity will never come to the fore.
Both Cultural Marxism and R2K will lose as Christ will conquer both.