The “two Kingdoms” perspective:
This discussion is sometimes caught up in eschatological debate: is the Kingdom of God only future or is it in some sense present now? Sometimes it is waylaid by debates about the roles of church and state (as Horton’s exposition of the “two kingdoms” view on 206-217). But apart from these debates, isn’t it obvious that when people come to trust in Christ they seek to bring biblical standards to bear in their workplaces? Paul says, “So, whether you eat or drink, or whatever you do, do all to the glory of God.” (1 Cor. 10:31) Can we possibly exclude from “whatever” our work in politics, the arts, or finance? And can we possibly forbid the church to give us guidance in our attempts to improve society?
What does it mean to be engaged in politics to the glory of God? That is not always easy to define. I would agree with Horton that Christians often exaggerate their expertise on social issues; sometimes nonbelievers can do a better job of gathering the relevant facts. But if I am charged with the work of planning national health care, I certainly must ask how biblical principles apply to that. When a believer produces a sculpture, it may be difficult for him to see how his faith is relevant to each stroke of his tool; but he certainly doesn’t want critics referring to it as a symptom of modern nihilism.
So Christless Christianity is essentially an evaluation of the American church, not from the standpoint of a generic Protestant theology, but from what I must regard as a narrow, factional, even sectarian perspective. Readers need to understand this.