Abstract: This randomized controlled study measured the effect of chaplain interventions on coronary artery bypass graft (CABG) patients over time. One hundred sixty-six CABG patients, received pre- and post-surgery testing at 1 month and 6 months with four instruments. Five chaplain visits were made to the intervention group, the control group received none. Comparison scores for anxiety, depression, hope, positive and negative religious coping, and religious coping styles were analyzed. Significant difference was found between groups in positive religious coping (PRC) (p = .023) and negative religious coping (NRC) (p = .046) scores over time. PRC increased in intervention group, decreased in the control group while NRC decreased in intervention group and increased in the control group. Demographics were comparable between groups. Moderate chaplain visits (average total visits time, 44 min) may be effective in helping CABG patients increase positive religious coping and decrease negative religious coping.