Theonomists seek to alleviate secularists’ fears of an armed theocratic take-over which will institute God’s law by saying, “It will happen when the gospel takes wide effect.” In other words, they won’t be imposing a Shariah-type law because most of the populace will be Christian and will gladly accept it.
I grant that they make such a distinction. I just don’t think it matters. If postmillennialism ends up being true and the people accept Christ and Christ gives them His Spirit, then what’s the deal with the law anyway? You already have a godly society. There are Christians today who are very godly yet reject theonomy. Banner of Truth, for one. The point is this: if the only way in which “godly law” will be instituted is when most of the populace is Christian, then why are you even focused on reconstruction? By your own admission you can’t do anything about it in the near, foreseeable future. And if society is converted, then they are going to be living godlily (sp?), Moses’s law or not.