The Skeptic's Dictionary describes ACIM as "a minimal market" that's extremely commercialized and characterizes it as "Christianity improved". Robert T. Carroll wrote which the teachings are certainly not unique but are culled from "many resources, east, and west". A subreddit for college students of A Course in Miracles. From acim.org: https://www.youtube.com/channel/UCTleG6-484F7WHZD0hAjRRw