This thesis aims to analyze the current status of Catholic religious education in Catholic kindergartens and suggest what the teachers should be supported by. Accordingly, research questions are as follow: First, what is under discussion on the possibilities and practices of childhood religious education? Second, what is the current state of childhood religious education at Catholic kindergartens in Seoul diocese, Korea? Third, how do the teachers in Catholic kindergartens understand and practice childhood religious education? I referred the possibilities and practices of religious education for children to the theories of Maria Montessori, Ronald Goldman and Thomas Groome. Based on these theoretical foundations, I looked into the current state of Catholic childhood religious education and had in-depth interviews with teachers on how they understand and practice Catholic childhood religious education. The questions for interviews are categorized as four main parts: ‘personal characters’, ‘attitudes toward faith’, ‘the current state of religious education in kindergartens’, and ‘personal opinions on religious education’. In conclusion, the teachers’ opinions on the current state of Catholic childhood religious education are divided: in the negative point of view, teachers refer to ‘lack of time in religious education courses’, ‘discord between teachers and non-believing parents’, ‘insufficiency of textbooks and reference books for teachers’, and ‘short of religious training for teachers’. On the other hand, in the positive point of view, teachers point out ‘good influence on children through informal education and religious atmosphere’, ‘parents’ awareness of the importance of religious education since childhood’, ‘religious education in harmony with fostering good human nature’, and ‘teachers’ participation in various activities at parish helpful as teachers’. My suggestions are following. First, it is necessary to establish a variety of educational models for religious education curriculums. Second, it is necessary to make harmony between national kindergarten curriculum and Catholic religious education. Third, it is necessary to develop and operate a teacher education program to support teachers. Lastly, because religious education is likely to affected by educational environments, it is important to build religious atmosphere in the Catholic kindergartens.