The Bible is opposed to centralism, whether it’s political (United Nations) or religious (World Council of Churches). The tower of Babel and God’s scattering of those who were involved in its design were judged because of the potential corruption that is inherent in religious and political centralism.
God’s sovereignty includes ownership of all His creation. Melchizedek, in blessing Abram, said, "Blessed be Abram of God Most High, Possessor of heaven and earth (Gen. 14:19; cf. v. 22). The Bible continues the relationship between sovereignty and ownership by declaring to Israel that all the Earth is His (Ex. 19:5).
Many Christian organizations and churches exist exclusively as spiritual fire houses. When they see a fire, they send a fire engine to douse it. They then return to the fire house to polish the fire engine awaiting another call.
Can a biblically-based government (including the civil sphere) operate within the conceptual framework of pluralism? While it depends on the definition of pluralism, let me say that the modern concept of pluralism is one of the most pernicious inventions of the twentieth century designed to eliminate the Christian religion.
The debate in Columbus’ day was not over whether the Earth was flat or round. Rather, the width of the ocean was the crucial factor; the distance between continents determined the cost and feasibility of an expedition. "The issue was the width of the ocean; and therein the opposition was right." Columbus had underestimated the circumference of the Earth and the width of the ocean by a significant number of miles.
The modern mind cannot bear the thought that people who lived far before the twentieth century could have gotten anything right about science. Even the Encyclopedia Britannica perpetuated the myth of a flat-earth cosmology: "Before Columbus proved the world was round, people thought the horizon marked its edge. Today we know better" (1961). The people of Columbus’ day knew better.