The Roman Catholic Church - nigh on 2000 years of oppression, mind-fuck, wholesale massacre, fascist collusion, inquisition, torture & terror that makes The Third Reich look like choir boys (members of the Third Reich look on nervously) and still actively promoting superstition, lies and ignorance to this day! Some nice architecture though, and music, and liturgy, and gew-gaws, but worrying to think people still take it seriously & that such a mind-numbing travesty of spirituality has a place in the modern world.