The Skeptic's Dictionary describes ACIM as "a minor field" which is overly commercialized and characterizes it as "Christianity improved". Robert T. Carroll wrote the teachings will not be original but are culled from "a variety of sources, east, and west". would be the Rosetta stone that may render the Course https://nondualityonline.com/school-teachings/what-is-a-course-in-miracles/