Religious disagreement, like disagreement in science, stands to deliver important epistemic benefits. But religious communities tend to frown on it. A salient reason is that, whereas scientists should be neutral toward the topics they discuss, religious believers should be loyal to God; and religious disagreement, they argue, is disloyal. For it often involves discussion with people who believe more negatively about God than you do, putting you at risk of forming negative beliefs yourself. And forming negative beliefs about someone, or even being open to doing so, is disloyal. A loyal person, says the objector, should instead exhibit doxastic partiality, doing her best to...