In terms of eschatology, it is so important to accurately portray an opposing position before engaging with it. So often, this is not the case and the result is a complete failure of any kind of productive dialog. As far as I understand the issues involved, I think Dr. Storms does a fine job of accurately representing the post-millennial view in this article below: (original source here)
“that view of the last things which holds that the Kingdom of God is now being extended in the world through the preaching of the Gospel and the saving work of the Holy Spirit in the hearts of individuals, that the world eventually is to be Christianized, and that the return of Christ is to occur at the close of a long period of righteousness and peace commonly called the ‘Millennium.’ . . . The Millennium to which the Postmillennialist looks forward is thus a golden age of spiritual prosperity during this present dispensation, that is, during the Church age, and is to be brought about through forces now active in the world. It is an indefinitely long period of time, perhaps much longer than a literal one thousand years. The changed character of individuals will be reflected in an uplifted social, economic, political and cultural life of mankind. . . . This does not mean that there ever will be a time on this earth when every person will be a Christian, or that all sin will be abolished. But it does mean that evil in all its many forms eventually will be reduced to negligible proportions, that Christian principles will be the rule, not the exception, and that Christ will return to a truly Christianized world” (The Millennium, 14; emphasis mine).
(1) According to postmillennialism, the Kingdom of God is primarily the rule or reign of God spiritually in and over the hearts of men. Thus the kingdom is truly present in this age and is visibly represented by the Church of Jesus Christ. In other words, the kingdom “arrives” and is “present” wherever and whenever people believe the gospel and commit themselves to the sovereignty of Jesus Christ as Lord.
(2) The kingdom is not to be thought of as arriving instantaneously or wholly by means of some cataclysmic event at the end of the age (an event such as the Second Coming of Christ). Indeed, the very name POST-millennialism indicates that Christ will return only after the kingdom has come in its fullness. The “arrival” of the kingdom, therefore, is gradual or by degrees. There may well be extended seasons in the life of the church where little visible and tangible progress is detected, indeed, even times when the church appears to regress in terms of its global influence. But postmillennialists are quick to remind us that we must take the long view and not succumb to the pessimism that easily grows in the soil of short-term setbacks. Whereas Satan’s kingdom may appear at times to experience a growth parallel to, if not greater than, that of Christ, the latter will most assuredly overcome all opposition in every sphere of life until the nations are brought into submission to him.
(3) The means by which the kingdom extends itself is the gospel of Jesus Christ. The continuing spread and influence of the gospel will increasingly, and in direct proportion thereto, introduce the kingdom. This gradual (but constantly growing) success of the gospel will be brought about by the power of the Holy Spirit working through the Church. Eventually the greater part, but not necessarily all, of the world’s population will be converted to Christ. As Greg Bahnsen explains, “the essential distinctive of postmillennialism is its scripturally derived, sure expectation of gospel prosperity for the church during the present age” (“The Prima Facie Acceptability of Postmillennialism,” in The Journal of Christian Reconstruction, III, Winter 1976-77, 66).
As Doug Wilson explains: “the gospel will continue to grow and flourish throughout the world, more and more individuals will be converted, the nations will stream to Christ, and the Great Commission will finally be successfully completed. The earth will be as full of the knowledge of the Lord as the waters cover the sea. When that happens, generation after generation will love and serve the Lord faithfully. And then the end will come” (Heaven Misplaced, 10). Continue reading