The Christian Universe is an unabashed defense of Christianity against the unbelief and indifference of our age: all who would deny human freedom and responsibility, all who would maintain that life and existence are meaningless, and all who (under whatever banner) would persuade us that the secular is all in all, or that nothing beyond our own immediate empirical world can be known.
Under Mascall's lens, those who hold such positions are seen as offering a dreary and impoverished universe, "quite incapable of satisfying our needs and aspirations." In contrast, he upholds "the wonder and glory of Christianity, " its unique revelation and reconciliation with God as the heart of the cosmic process, and its faith not a defiance or negation of the world, but an affirmation that there is meaning to the world.