Q&A: How to respond to someone who believes all religions are true (omnism) — expose internal contradictions, reconstruct their actual theology

Winger recommends exposing direct contradictions between religions — e.g., Islam denies Jesus is God's Son and denies his death and resurrection; Christianity centers on exactly these claims. One cannot hold both simultaneously. Tactical suggestion: have the person articulate what they actually believe from each religion, write it out as their own theology, then challenge each claim. This reveals they do not actually believe all religions but have constructed a private syncretistic religion.