Two major obstacles to belief in God in the twenty-first century are the idea that science is incompatible with religious faith, and the idea that the diversity of religions undermines the credibility of belief that any one religion could be truer than the others. This book addresses both of these challenges to belief in God and explores a connection between them. It argues that science and religion are not only compatible, but that some recent scientific discoveries actually support belief in the existence of the Creator God. The diversity of religions is widely believed to undermine the credibility of religious truth claims because of the assumed lack of any way to settle disagreements between different religions. This book argues that one rational way to adjudicate disagreements between the claims of diverse religions is to assess their consistency with contemporary science. The book considers how Christian theism and Buddhism fare in harmonizing their metaphysical frameworks with contemporary scientific cosmology. Although both theistic and Buddhist worldviews resonate with many recent scientific discoveries, the Big Bang theory and cosmic fine-tuning favor the Christian doctrine of creation.