Over the past three decades political relationships between mainland China and Taiwan have fluctuated precariously between warm peace and cold war. Instead of playing the role of the biblical peacemaker, Christian theologians on both sides have developed irreconcilable nationalist theologies in order to sanctify their respective nationalist programs: Chinese unification versus Taiwanese independence. For the purpose of constructing peace across the Taiwan Strait, a new political theology needs to be built on the centrality of religious freedom to be found in the Bible, democratic values, and the actual politics of both China and Taiwan. The second section of this article analyzes the biblical sources of a Chinese unification theology and a Taiwanese independence theology. The third and fourth sections introduce the historical development of nationalism and nationalist theology in both societies. The fifth section concludes by proposing a democratic union theology that builds on the centrality of religious freedom in the Bible, democratic values, and actual politics.