This research reports an exploratory study of 22 pre-service teachers involved in the Religious Education courses offered by The University of Notre Dame Australia, as part of the university's accreditation to teach religious education. The study examined the influence of key factors on how confident these pre-service teachers perceived themselves to be to engage with the necessary knowledge to effectively teach religious education in a Catholic school. The pre-service teachers were surveyed pre and post their final-year internship, and subsequently, six of these were interviewed at the end of their first term of employment. Results indicated that out of the five compulsory courses, the two teaching method courses were found to be most influential in developing confidence to teach. Family, religious background, schooling, and mentoring were found to be influential in confidence development. In addition, confidence improved across the timeframe.