Philosophy of religion enjoyed a renaissance in the final third of the twentieth century. Its fruits include important contributions to both natural theology, the enterprise of arguing for theism, and natural atheology, the enterprise of arguing against it. In natural theology philosophers produced new versions of ontological, cosmological, and teleological arguments for the existence of God. In natural atheology problems of evil, which have always been the chief arguments against theism, were much discussed, and philosophers debated proposed solutions to both the logical problem of evil and the evidential problem of evil.

Natural Theology

Building on work by Charles Hartshorne and Norman Malcolm, Alvin Plantinga (1974) formulated a model ontological argument for the existence of God that employs the metaphysics of possible worlds. Let it be stipulated that being unsurpassably great is logically equivalent to being maximally excellent in every possible...