At his passing in 1885, Scottish advocate and judge, Lord Adam Gifford—a political Radical and philosophical enthusiast—bequeathed £80,000 to four Scottish universities in order to establish a series of lectures. This series—aimed at “promoting, advancing, teaching, and diffusing the study of natural theology . . . [or] in other words, ‘the knowledge of God’”—is now known as the prestigious Gifford Lecture Series. Once described as “the highest honor in a philosopher’s career” by historian Jacques Barzun, the series has featured scholars Karl Barth, Alister McGrath, Noam Chomsky, Jürgen Moltmann, Richard Dawkins, Carl Sagan, William James, and many other distinguished lecturers over the years. This group of philosophers, theologians, scientists, writers, ethicists, and historians use their specific fields of expertise to explore a robust array of topics surrounding natural theology—knowledge of God through “natural” means, or through ordinary experience and reason. Lord Gifford’s de...