Faith and culture
Must a convert give up the customs they were raised in?
The Catholic Church recognizes in other religions that search, among shadows and images, for the God who is unknown yet near since he gives life and breath and all things and wants all men to be saved. Thus, the Church considers all goodness and truth found in these religions as "a preparation for the Gospel and given by him who enlightens all men that they may at length have life." LG 16; cf. NA 2; EN 53.
By her very mission, "the Church . . . travels the same journey as all humanity and shares the same earthly lot with the world: she is to be a leaven and, as it were, the soul of human society in its renewal by Christ and transformation into the family of God." GS 40 # 2. Missionary endeavor requires patience. It begins with the proclamation of the Gospel to peoples and groups who do not yet believe in Christ, Cf. RMiss 42 47. continues with the establishment of Christian communities that are "a sign of God's presence in the world," AG 15 # 1. and leads to the foundation of local churches. Cf. RMiss 48-49. It must involve a process of inculturation if the Gospel is to take flesh in each people's culture. Cf. RMiss 52-54. There will be times of defeat. "With regard to individuals, groups, and peoples it is only by degrees that [the Church] touches and penetrates them and so receives them into a fullness which is Catholic." AG 6 # 2.
The celebration of the liturgy, therefore, should correspond to the genius and culture of the different peoples. Cf. SC 37-40. In order that the mystery of Christ be "made known to all the nations . . . to bring about the obedience of faith," Rom 16:26. it must be proclaimed, celebrated, and lived in all cultures in such a way that they themselves are not abolished by it, but redeemed and fulfilled: Cf. CT 53. It is with and through their own human culture, assumed and transfigured by Christ, that the multitude of God's children has access to the Father, in order to glorify him in the one Spirit.
"In the liturgy, above all that of the sacraments, there is an immutable part, a part that is divinely instituted and of which the Church is the guardian, and parts that can be changed, which the Church has the power and on occasion also the duty to adapt to the cultures of recently evangelized peoples." John Paul II, Vicesimus quintus annus, 16; cf. SC 21.
"Liturgical diversity can be a source of enrichment, but it can also provoke tensions, mutual misunderstandings, and even schisms. In this matter it is clear that diversity must not damage unity. It must express only fidelity to the common faith, to the sacramental signs that the Church has received from Christ, and to hierarchical communion. Cultural adaptation also requires a conversion of heart and even, where necessary, a breaking with ancestral customs incompatible with the Catholic faith." John Paul 11, Vicesimus quintus annus, 16.