We are completely agreed on the subject, I think, Peter. My friend Dan likes to describe old-style Postmillennialism (or "true Postmillennialism" if you prefer) as "Optimistic Amillennialism" because of it's emphasis on the transforming power of the gospel rather than reliance upon the State to impose "Christian character" on an unregenerate population.

That said, I do believe that civil laws sooner or later boil down to someone's idea of "morality," whether Christian or not. Most folks, Christian or not, agree that laws against the use of force and fraud in the ordinary dealings of citizens is immoral and therefore good for the State to enforce, but that religious laws or laws that impose religious values on the population are "immoral."

-R