This course examines the triumph of secular naturalism in academic/educated culture, and proposes rational grounds for advancing historic Christian theism. Trinitarian faith is viewed here as having the structure of theories that postulate the existence of unobservable objects. These theories adopt a unique method of defining the entities or beings postulated to exist; this method is shown to be compatible with historic theism. Moreover, the Resurrection of Jesus is identified as the central tenet for which evidence additional to that found Holy Scripture is needed in our secular context. The Shroud of Turin and contemporary visions of Jesus are shown to offer such evidence. While no objection is registered to allowing science to explore any features of the Universe, Christian theism is presented as supplementing such scientific knowledge.