“In the beginning God created the heavens and the earth.” Holy Scripture begins with these solemn words. the profession of faith takes them up when it confesses that God the Father almighty is “Creator of heaven and earth” (Apostles’ Creed), “of all that is, seen and unseen” (Nicene Creed). We shall speak first of the Creator, then of creation and finally of the fall into sin from which Jesus Christ, the Son of God, came to raise us up again.
Creation is the foundation of “all God’s saving plans,” the “beginning of the history of salvation” that culminates in Christ. Conversely, the mystery of Christ casts conclusive light on the mystery of creation and reveals the end for which “in the beginning God created the heavens and the earth”: from the beginning, God envisaged the glory of the new creation in Christ.
And so the readings of the Easter Vigil, the celebration of the new creation in Christ, begin with the creation account; likewise in the Byzantine liturgy, the account of creation always constitutes the first reading at the vigils of the great feasts of the Lord. According to ancient witnesses the instruction of catechumens for Baptism followed the same itinerary.
From the Catechism of the Catholic Church 279-281