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Highlights • The standard positive correlation between religiosity and well-being is found in an elderly Japanese sample. • However, multivariate analyses that include agreeableness and conscientiousness as rival predictors radically alters the findings — religiosity's unique well-being is substantially weakened and often statistically annulled. • Personality and sociodemographic variables are consistently found to be more robust well-being predictors than religiosity. • These findings raise considerable doubt over the claim that religiosity contributes to successful aging in Japan. • Recent calls for the faith-status of patients utilizing gerontology services to be assessed for diagnostic purposes appear pre-mature. Abstract Recent findings suggest that the belief-as-benefit effect (BABE) — the positive association between religiosity and health/well-being — is a spurious correlation voided by personality traits. The current paper investigates the cross-sectional relationships among personality, religiosity and psychological well-being in an older adult sample randomly-selected from Tokyo, Japan. Correlation and Hierarchical Regression Modelling (HRM)—with a two one-sided test (TOST) of equivalence—is utilized. The standard BABE correlation is reproduced. However, HRM utilizing a meaningful benchmark of effect (β ≥.15) largely neuters the result after controlling for trait agreeableness and conscientiousness. Religiosity does remain statistically related to the purpose in life and positive relationships sub-scales; though it explains just a sliver of variance in both instances. Compared to religiosity, agreeableness, conscientiousness and education level were more substantial and consistent well-being predictors. Whether religiosity auspices the psychological health of older Japanese adults thus remains to be established. [ABSTRACT FROM AUTHOR]