Educators at religious preK-12 schools attempt to integrate their faith into their teaching. Yet there is limited empirical study about how faith integration self-efficacy may develop. This study examines the relationships between the faith integration self-efficacy of educators at Mennonite preK-12 schools and their past educational experiences and initial teacher education. Regression analysis of survey responses indicates that the quality of initial teacher education is associated with educators' faith integration self-efficacy. However, having attended a Mennonite preK-12 school or a Christian undergraduate institution were not predictive of faith integration self-efficacy. Discussion of results highlights implications for educators and future research.