Pedagogically valuable identity of Catholic Religious Education stems from its multiple value in educational system of the Republic of Croatia: educational, theological-ecclesiological, historical, cultural and values identity. The need for more specific determination of pedagogically valuable identity of Catholic Religious Education in public school in the Republic of Croatia, its fundamental dimensions in school system in the context of temporary educational needs and challenges, as well as the projection of its developmental path in the future has been set as an open field of scientific research based on which this doctoral dissertation has been written. Scientific and technical contribution of this research is in (re)defining pedagogically valuable identity of Catholic Religious Education in public school, its fundamental curricular settings as compared to identity and purpose of other complementary extracurricular school models, determining religious and pedagogical possibilities and limitations of Catholic Religious Education in school context which presupposes extent of authority and decision making of relevant religious and educational authorities on different levels, projection of the Catholic Religious Education development in the next ten years according to measures and initiatives proposed by relevant authorities of the Republic of Croatia. It is a quantitative and qualitative research in which classical Delphi method was used in a sample of 34 persons from the Republic of Croatia and the Republic of Bosnia and Herzegovina (17 expert scientists and 17 practitioners). A questionnaire was used as an instrument. The study comprised three phases of questioning. According to the gained data, decision makers in the field of Catholic Religious Education set curriculum „purification“ of the subject in accordance with its pedagogical and valuable identity and fundamental social humanistic habitus as a priority task as well as designing new religious pedagogical guidelines for establishing synergistic relation between Religious Education in school and parish catechist (in outcomes, programmes design, and organisation of implementation). Since Croatian school system is in a phase of comprehensive curriculum reform in which Religious Education is also involved, it is expected that the results of this research will find their place in this context with regard to constructive scientific and practical guidelines of valuable and pedagogical design of this subject in the future from which all actors involved will benefit.