Traditionalism (perennialism)
Traditionalism, also known as the Traditionalist School, is a school of thought within perennial philosophy. Originating in the thought of René Guénon in the 20th century, it proposes that a single primordial, metaphysical truth forms the source for, and is shared by, all the major world religions.
Source: Wikipedia — Traditionalism (perennialism) (CC BY-SA 4.0)