This paper aims to raise a question critically and propose improvement plans regarding the ‘2015 Revised Curriculum in Religious Studies’ from a perspective on religious education of which Catholic schools in Korea are in pursuit. The Catholic school as a educational institution of the Catholic Church has clear educational philosophy and mission of ‘evangelization through education’ and ‘holistic human formation’ based on the Gospel of Christ. And Catholic schools have firm beliefs that these two fundamental educational mission can be best achieved through religious education in the school. Catholic secondary schools in Korea, through religious education based on Christianity, have brought positive educational outcomes such as students’ spiritual development, morality and personality development, cultivation of the religious sense, respect for life, and openness and respect for other religions. Also, Catholic secondary schools are considerate of students who believe in other religion on the basis of the Church’s teaching that “Faith is a free response of the human person to God.” However, ‘2015 Revised Curriculum in Religious Studies’, with the rationale that religious schools including Catholic schools should consider other religions in multi-religious societies and keep publicness on religious education, disregards the distinctness and uniqueness of religious education that religious schools pursue and forces to teach religious studies only in religion education even in religious schools. As such, this paper raises three critical questions regarding ‘2015 Revised Curriculum in Religious Studies’ and proposes alternatives. The questions are as follows: 1) Why should the subject name of religious education in the religious school be called as ‘religious studies’?, 2) Why does it require to offer other courses for students who do not want to take it even though religious education has been stipulated as ‘religious studies’? 3) Has it considered the interests and education levels of students? In conclusion, this paper argues that ‘2015 Revised Curriculum in Religious Studies’ and religious education as religious studies with which the Ministry of Education has pushed ahead should be done in public schools, not in religious schools including Catholic school and its educational outcomes will be very limited. And this paper suggests that the Ministry of Education should continuously explore ways to ensure freedom of religious beliefs that all students have and, at the same time, respect the unique educational philosophy and mission that religious schools have. Also, this paper emphasizes that it is the educational spirit in this day and age that the Ministry of Education should propose various ways of religious education that enables students to develop spirituality, morality, personality, cultivation of religious sense, and respect for life, with openness and respect for other religions.