This book offers a groundbreaking psychological exploration of how religion influences sport performance, motivation, injury recovery, and interpersonal dynamics in athletic settings. Bridging sport psychology and religious studies, it introduces two original models — the Religion and Sport Performance (RSP) Model and the Religious–Psychological Adaptation to Sports Injury (RPASI) Model — to explain how faith shapes athletes' cognitive, emotional, and behavioral responses on and off the field. Rather than treating religion as a cultural backdrop, the book positions it as a powerful psychological force that can enhance concentration, resilience, and identity. Drawing on diverse religious traditions and supported by real-world case examples, it examines how athletes integrate prayer, ritual, and belief into performance preparation and injury recovery. It also explores how religion influences team dynamics, coach-athlete relationships, and ethical decision-making in multicultural sport contexts. This concise yet comprehensive book is ideal for sport psychologists, coaches, researchers, and undergraduate and graduate students interested in the intersection of mental performance and religious belief. It offers both theoretical insight and practical guidance for applying religion-informed psychological strategies in sport environments.