Objective: To describe the design of, and participant-level outcomes related to, a religiously tailored, peer-led group education program aimed at enhancing Muslim women's mammography intention. Method: Using a community-engaged approach and mixed methods, we identified and addressed barrier beliefs impeding mammography screening among Muslim American women. Our religiously tailored, mosque-based, peer-led intervention involved facilitated discussions and expert-led didactics conveying health-related religious teachings, and information about the benefits and process of mammography. Barrier beliefs were addressed through reframing, reprioritizing, or reforming such beliefs. Participant surveys were collected preintervention, postintervention, 6 months postintervention, and 1 year postintervention. These measured changes in mammography intention, likelihood, confidence, and resonance with barrier and facilitator beliefs. Results: A total of 58 Muslim women (mean age = 50 years) that had not had a mammogram in the past 2 years participated in the two-session program. Self-reported likelihood of obtaining a mammogram increased significantly (p = 0.01) and coincided with a positive trend in confidence (p = 0.08). Individuals with higher agreement with barrier beliefs preintervention had lower odds for positive change in likelihood (odds ratio = 0.80, p = 0.03), while those who were married had higher odds for positive change in likelihood (odds ratio = 37.69, p = 0.02). At 1-year follow-up, 22 participants had obtained a mammogram. Conclusion: Our pilot mosque-based intervention demonstrated efficacy in improving Muslim women's self-reported likelihood of obtaining mammograms, and increased their mammography utilization, with nearly 40% obtaining a mammogram within 12 months of the intervention. Impact: Our conceptual model for religiously tailoring messages, along with its implementation curriculum, proved effective in enhancing the likelihood and receipt of mammograms among Muslim American women. Accordingly, our work advances both the theory and practice of faith-based interventions and provides a model for addressing Muslim women's cancer screening disparities.