Philosophers of religion

John Anderson (1 November 1893 – 6 July 1962) was a Scottish philosopher who occupied the post of Challis Professor of Philosophy at Sydney University from 1927 to 1958. He founded the empirical brand of philosophy known as Australian realism.
Anderson's promotion of 'freethought' in all subjects, including politics and morality, was controversial and brought him into constant conflict with the august senate of the university. However, he is credited with educating a generation of influential 'Andersonian' thinkers and activists—some of whom helped to place Sydney in the forefront of the 'sexual revolution' of the 1950s and 1960s.
To Anderson, an acceptable philosophy must have significant 'sweep' and be capable of challenging and moulding ideas in every aspect of intellect and society.

Pierre Hadot (; French: [ado]; 21 February 1922 – 24 April 2010) was a French philosopher and historian of philosophy specializing in ancient philosophy, particularly Epicureanism and Stoicism.

Paul Gerhard Natorp (24 January 1854 – 17 August 1924) was a German philosopher and educationalist, considered one of the co-founders of the Marburg school of neo-Kantianism. He was known as an authority on Plato.

Michel de Certeau (French: [sɛʁto]; 17 May 1925 – 9 January 1986) was a French Jesuit priest and scholar whose work combined history, psychoanalysis, philosophy, and the social sciences as well as hermeneutics, semiotics, ethnology, and religion. He was known as a philosopher of everyday life and widely regarded as a historian who had interests ranging from travelogues of the sixteenth and seventeenth centuries to contemporary urban life.A multidisciplinarian, he wrote ground-breaking studies in fields as diverse as mysticism, the act of faith, cultural dynamics in contemporary society, and historiography as an intellectual practice. His impact continues unabated, with new volumes appearing regularly, and perhaps surprisingly his reputation is growing even more rapidly in English and German-speaking countries and the Mediterranean than in his native France. This strong and growing interest in academia is not matched in the public sphere; however, partly due to his being considered a "difficult" author because of his highly personal style which makes translation difficult, and partly due to the declining status of French in the world generally. Nevertheless, portions of his prolific output have been translated into a dozen languages.

Eduard Gottlob Zeller (German: [ˈtsɛlɐ]; 22 January 1814, Kleinbottwar – 19 March 1908, Stuttgart) was a German philosopher and Protestant theologian of the Tübingen School of theology. He was well known for his writings on Ancient Greek philosophy, especially Pre-Socratic Philosophy, and most of all for his celebrated, multi-volume historical treatise The Philosophy of Greeks in their Historical Development (1844–52). Zeller was also a central figure in the revival of neo-Kantianism.