This study examines the influence of Christian nationalism in private Christian schools, with ABC Christian School in Southern California as a case study. It also explores its broader impact on American public education through parental rights groups pushing for book bans and curriculum changes. Survey data from former students and staff reveal the deep-rooted presence of Christian nationalist ideologies at ABC Christian School and their harmful effects, particularly on LGBTQ + students and racial minorities. The findings highlight the urgent need for educators to address these issues and promote inclusivity, diversity, and compassion in schools.