Another highly controversial topic, related to these 'priesthood' cultures, is the continuous prosecution of all Entheogenic and herbal cultures and its practitioners. From numerous genocides of indigenous shamanic cultures around the world, to the attacks on natural healthcare in Europe and the US in favor of the global pharmaceutical industry.
Research is also showing that entheogen stimulated spiritual experiences lie at the very hart of many indigenous and main religions, though of course hidden (sometimes in plain sight) and only allowed for a select group of initiates (See also: Entheogens). Most Christian people refuse to research and debate this topic, because it shows the how much the true history behind early Christianity has been suppressed and perverted into different forms of mythology, idolatry and dogma. It shows how much all main religions have strayed from the path of nature, empirical spirituality, honesty and freedom. (todo: early Judaic/Christian cultures, racial/cultural prosecutions)
Entheogenic cultures are always treated as a huge threat to the (in many places) dominating 'Western' belief systems, political structures and egoistic/materialistic/mechanical thinking. (todo: expand, entheogen misunderstandings, entheogen abuse, suppression of science, medical conspiracy and vitalism)