Critical belonging has been an essential feature of Christianity since its origin, but the forms it assumes understandably differ with the specific challenges Christians rise to meet throughout history. During the past two thousand years, these challenges have covered a broad spectrum: epistemic, moral, political, economic, religious, and spiritual. In our global society, all of these challenges seem to be occurring at once. Since no individual can meet all of them adequately, Toward a catholic Christianity tries to show how by working collaboratively the “people of God” can credibly meet them together. In this way, the diversity and unity within the Roman Catholic community are explicitly acknowledged and affirmed. For if that community is to become authentically Christian, it will need to become more genuinely catholic.