In the twentieth century, the concept of religion had a third expansion as it included practices that connect people to inanimate forces that lack minds. William James, for example, proposed that the concept of religion generally means a belief on a non-empirical structure, an “unseen order,” where human beings live accordingly. To clarify that what James was referring to does not include human-created structures, Clifford Geertz proposed that such order was fundamental and has existed even before human beings. Because of this expansion, atheistic worldviews characterized by a belief in this unseen order, such as Taoism, Buddhism, Stoicism, and Neo-Confucianism were considered religions.
Schilbrack, K. (2022). The Concept of Religion. In E. N. Zalta (Ed.), The Stanford Encyclopedia of Philosophy (Summer 2022). Metaphysics Research Lab, Stanford University. https://plato.stanford.edu/archives/sum2022/entries/concept-religion/
Were one asked to characterize the life of religion in the broadest and most general terms possible, one might say that it consists of the belief that there is an unseen order, and our supreme good lies in harmoniously adjusting ourselves thereto. (1902 [1985: 51]; cf. Proudfoot 2000)
In the twentieth century, one sees a third and last growth spurt in the extension of the concept. Here the concept religion is enlarged to include not only practices that connect people to one or more spirits, but also practices that connect people to “powers” or “forces” that lack minds, wills, and personalities. By an “unseen order”, James presumably means a structure that is non-empirical
The anthropologist Clifford Geertz addresses this issue, also defining religion in terms of an “order” but specifying that he means practices tied to conceptions of “a general order of existence”, that is, as he also says, something whose existence is “fundamental”, “all-pervading”, or “unconditioned”
The practices that are distinctly religious for Geertz are those tied to a culture’s metaphysics or worldview, their conception of “the overall shape of reality” (1973: 104). Like James, then, Geertz would include as religions not only the forms of life based on the theistic and polytheistic (or, more broadly, animist or spiritualist) beliefs that Herbert and Tylor recognized, but also those based on belief in the involuntary, spontaneous, or “natural” operations of the law of karma, the Dao in Daoism, the Principle in Neo-Confucianism, and the Logos in Stoicism. This expansion also includes Theravada Buddhism because dependent co-origination (pratītyasamutpāda) is a conception of the general order of existence and it includes Zen Buddhism because Buddha-nature is said to pervade everything. This third expansion is why non-theistic forms of Buddhism, excluded by the Herbert’s and Tylor’s definitions but today widely considered religions, can serve as “a litmus test” for definitions of the concept