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Genesis315
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Membership in the Church is something strictly defined to include Baptism, profession of the true faith, reception of the same sacraments, and hierarchical communion. Baptism is the door to the Church, but it is just a beginning. It incorporates one into Christ, at least partially. But, as the Vatican II decree on ecumenism states:
Ott’s Fundamentals of Catholic Dogma notes how Baptism creates an indestructible bond with the Church, even if it is less than membership:Baptism therefore establishes a sacramental bond of unity which links all who have been reborn by it. But of itself Baptism is only a beginning, an inauguration wholly directed toward the fullness of life in Christ. Baptism, therefore, envisages a complete profession of faith, complete incorporation in the system of salvation such as Christ willed it to be, and finally complete ingrafting in eucharistic communion.
Although public apostates and heretics, schismatics and excommunicati vitandi are outside the legal organisation of the Church, still their relationship to the Church is essentially different from that of the unbaptised. As the baptismal character which effects incorporation in the Church is indestructible, the baptised person, in spite of his ceasing to be a member of the Church, cannot cut himself off so completely from the Church, that every bond with the Church is dissolved.