The Root of All Religion by Alvin Boyd Kuhn is a scholarly and esoteric work that argues all major world religions share a common origin and a core set of underlying spiritual truths. Kuhn contends that modern religious beliefs, including Christianity, were derived from ancient, pre-existing mythological systems, primarily Egyptian astro-theology. Published originally in 1936, the book is considered an essential work for those interested in alternative perspectives on religious history and esoteric Christianity.