The article is focused on covering the topic “The Church’s Holy Scripture and Holy Tradition, Its Scriptures and Traditions” within the holistic and consistent process of teaching faith to modern adult catechumens. Based on the texts of the New Testament, patristic writings, studies by home and foreign theologians, as well as on the long-term personal catechetical experience, the authors consider the key concepts of this topic and offer their detalisation and systematisation. The article addresses the peculiarities of associating various layers of scripture and tradition with Divine Revelation and the knowledge of God. Possible errors and contradictions of their interpretation are also highlighted. As a result, it is concluded that catechum...