The issue of the relationship between the Old and New Testaments, while mostly settled within particular denominations, continues to be something that Christians disagree over — especially on the details. Here at the center of Acts Luke describes how the kingdom of Christ relates to theological disagreement. He shows in particular that Christ rules His church in the midst of theological battle through the collective wisdom of the elders gathered in council. This principle continues to be honored in some form or fashion through most denominations by the recognition that if you can't agree, you need to get the elders to come together and, in the presence of God, make a decision. So Christ truly reigns; you can be certain of that, in the face of theological debate over key issues like the sacraments and the differences between Christianity and Judaism.