The first moral error of political liberalism is propitiationism. According to this notion I should do unto others as they want; according to Christianity I should do unto others as they need. Numerous mental habits contribute to the propitiationist frame of mind. Most of my college students, for instance, think "need" and "want" are just synonyms... Christians can slip into propitiationism by misunderstanding the Golden Rule. This happens when we read Do unto others as you would have them do unto you as though it implied Do unto others as they would have you do unto them-"I'd want others to honor my demands, so I should honor theirs." The mistake lies in overlooking the fact that the "you" to whom the precept is addressed is a free subject of the kingdom of heaven, not a stranger. We are therefore speaking of what in Christ we would have others do unto us-to minister to our godly needs, not to our foolish or sinful wants. Unto others we should minister in the same way. It follows that keeping the Golden Rule may even mean saying "No" or suggesting a better way.And from the Critique of Conservatism:
The second moral error of political conservatism is instrumentalism. According to this notion faith should be used for the ends of the state; according to Christianity believers should certainly be good citizens, but faith is not a tool... Religious conservatives who pine for the days when jurists called America "a Christian country" and recognized Christianity as "the law of the land" are deeply in error if they think such statements expressed belief; what they expressed was instrumentalism. In those days the religion that came to hand was Christianity (or at least its counterfeit in civil religion), and the speakers were interested primarily in how it could be used... Viewed from this perspective, the contrast between the jurisprudence of yesterday and today is not nearly as sharp as religious conservatives make it out to be.