Abstract

The term “natural religion” is sometimes taken to refer to a pantheistic doctrine according to which nature itself is divine. “Natural theology”, by contrast, originally referred to (and still sometimes refers to)[1] the project of arguing for the existence of God on the basis of observed natural facts. In contemporary philosophy, however, both “natural religion” and “natural theology” typically refer to the project of using all of the cognitive faculties that are “natural” to human beings—reason, sense-perception, introspection—to investigate religious or theological matters. Natural religion or theology, on the present understanding, is not limited to empirical inquiry into nature, and it is not wedded to a pantheistic result. It does, however, avoid appeals to special non-natural faculties (ESP, telepathy, mystical experience) or supernatural sources of information (sacred texts, revealed theology, creedal authorities, direct supernatural communication). In general, natural religion or theology (hereafter “natural theology”) aims to adhere to the same standards of rational investigation as other philosophical and scientific enterprises, and is subject to the same methods of evaluation and critique. Natural theology is typically contrasted with “revealed theology”, where the latter explicitly appeals to special revelations such as miracles, scriptures, and divinely-superintended commentaries and creedal formulations. (See DeCruz and DeSmedt 2015) Philosophers and religious thinkers across almost every epoch and tradition (Near Eastern, African, Asian, and European) have engaged the project of natural theology, either as proponents or critics. The question of whether natural theology is a viable project is at the root of some of the deepest religious divisions: Shi’ite thinkers are optimistic about reason’s ability to prove various theological and ethical truths, for instance, while Sunnis are not; Roman Catholic theologians typically think that reason provides demonstrations of the existence of God, while many Protestant theologians do not. Unlike most of the topics discussed in an encyclopedia of philosophy, this is one over which wars have been fought and throats have been cut. The most active discussions of natural theology in the West occurred during the high medieval period (roughly 1100–1400 C.E.) and the early modern period (1600–1800 C.E.). The past few decades have witnessed a revival of natural theological debate in the public sphere: there are now institutes promoting “Intelligent Design Theory”, popular apologetics courses, campus debates between believers and agnostics, a “New Atheist” movement, Youtube debates between apologists and atheists regarding new books in natural theology (such as the one between Nathan Lewis and Bernie Dehler on the Blackwell Companion to Natural Theology),[2] and TED talks by famous atheists on how to resist natural religion (such as the one by Richard Dawkins in February 2002).[3] Among professional philosophers (who aren’t typically part of these more popular debates), arguments over our ability to justify positive or negative answers to religious questions have become fairly technical, often employing sophisticated logical techniques in an effort to advance the discussion instead of retreading the same old ground. The prestigious Gifford Lectures series hosted by a consortium of Scottish universities, however, has tried to feature new but still accessible work in natural theology for over 100 years (it too has a Youtube channel!)[4] In this article, we aim to avoid most the more recent complexities but also explain their origins by focusing on some central developments in the early modern period that helped to frame contemporary natural theological debates. We are focused here only on theoretical arguments (both a priori and a posteriori or empirical ones). It is controversial whether moral arguments are also part of natural theology, but we set them aside here (see also the entry on God, arguments for the existence of: moral arguments).