In Alvin Plantinga’s 1980 address to the American Catholic Philosophical Association “The Reformed Objection to Natural Theology”,[i] the proposition God exists is declared to be properly basic by the reformers and as a result natural theology—the arguments for God’s existence—is unnecessary. Following a brief summary of Plantinga’s paper, three benefits of properly basic beliefs will be outlined, and then three reasons will be presented as to why the complete rejection of natural theology using Plantinga’s account of properly basic beliefs simply goes too far.
Plantinga points out this conclusion by establishing that the Classical foundationalist approach of knowledge (commonly attributed to Plato through Aquinas and then a modified form to Descrates through the 20th Century) required all knowledge be built upon certain foundational propositions—namely those that are either self-evident, evident to the senses, or incorrigible—made natural theology necessary. However, reformers like John Calvin rejected Classical foundationalism (in lieu of a form of weak foundationalism) on the grounds that God exists is a foundational proposition per scripture but does not fit the requirements to be a foundational proposition (that is the existence of God is not self-evident, evident to the senses, or incorrigible). As a result, since theologians no longer need to work with foundational principles to arrive at the knowledge of God natural theology becomes unnecessary. Joseph Boyle’s response to Plantinga concisely captures the line of thought: “The Christian knows God exists. Natural theology makes sense only if God's existence is not in the foundations. But it is.”[ii]