Liturgical catechesis aims to initiate people into the mystery of Christ (It is "mystagogy.") by proceeding from the visible to the invisible, from the sign to the thing signified, from the "sacraments" to the "mysteries." Such catechesis is to be presented by local and regional catechisms. This Catechism, which aims to serve the whole Church in all the diversity of her rites and cultures, will present what is fundamental and common to the whole Church in the liturgy as mystery and as celebration (Section One), and then the seven sacraments and the sacramentals (Section Two).Helpful and in many ways sufficient as I have found this paragraph to be, the last sentence is problematic. At best it is a poorly written sentence and at worst its confusion between the tasks of catechesis and sacrament.
This Catechism, which aims to serve the whole Church in all the diversity of her rites and cultures, will present what is fundamental and common to the mystery of the whole Church in (Section One [Creed]) [profession], as celebration (Section Two [the seven sacraments and the sacramentals], moral living (Section three [Life in Christ]), and prayer (Section four [devotion and intimacy with God]).That way, the clear catechetical difference between creed (professing), sacraments (celebrating), life in Christ [moral living], and prayer [devout intimacy with God] would be identified as distinct but interdependent lines of approach to forming the billions of Catholic Christians. Further, each of those domains can thus be called a public work of the Church, and each is essential and interdependent on the other.