The study investigated the influence of staff training and development on service delivery and organizational capacity at All Saints Church, Nakasero, Kampala. Employing a cross-sectional survey design, data were collected from 114 respondents including clergy, staff members, and volunteers. The findings demonstrated that systematic training interventions significantly enhanced service quality, with 83.3% of respondents reporting improved performance following participation in development programs. Results indicated strong positive correlations between training frequency, skill development, and organizational effectiveness. The study concluded that continuous professional development constitutes a critical driver of organizational capacity and service excellence in non-governmental religious institutions. Recommendations emphasized establishing structured training frameworks, allocating adequate resources for capacity building, and implementing systematic evaluation mechanisms to ensure training effectiveness and sustainability.