IntroductionReligion is a salient aspect of patient background in treatment (The psychology of religion and coping: Theory, research, practice; Guilford Press). However, research investigating the role of religion in suicide is lacking and inconsistent (Journal of Religion and Health, 57, 2478–2499). The current study (1) clarifies the association between religious identity and fearlessness about death in a psychiatric sample and (2) tests whether religious identity moderates the association between fearlessness about death and suicidal ideation.MethodsParticipants were 155 patients seeking treatment in a partial hospital program. Religious identity was assessed using the Identities in Treatment Scale (The Behavior Therapist). Fearlessness about death was assessed with two relevant items from the acquired capability with rehearsal for suicide scale (Psychological Assessment, 28, 1452–1464), as in prior studies (Suicide & Le‐Threatening Behavior, 50, 1230–1240; Journal of Affective Disorders Reports, 12, 100492).ResultsFearlessness about death interacted with religious identity to predict suicidal ideation, b = 0.47, 95% C.I. [0.02, 0.91], p = 0.042. Conditional effects showed that greater fearlessness about death was associated with greater suicidal ideation among non‐religious patients, b = −0.56, 95% C.I. [−0.88, −0.24], p = 0.001, but not in religious patients, b = −0.09, 95% C.I. [−0.41, 0.22], p = 0.559.ConclusionsOur results suggest that fearlessness about death is a risk factor for suicidal ideation, but only among those who do not identify as religious. Results from this study inform theories of suicide and elucidate the influence of religious identity on links among suicide risk factors and suicide‐related outcomes.