Our profession of faith begins with God, for God is the First and the Last,1 The beginning and the end of everything. the Credo begins with God the Father, for the Father is the first divine person of the Most Holy Trinity; our Creed begins with the creation of heaven and earth, for creation is the beginning and the foundation of all God’s works.
“I believe in God”: this first affirmation of the Apostles’ Creed is also the most fundamental. the whole Creed speaks of God, and when it also speaks of man and of the world it does so in relation to God. the other articles of the Creed all depend on the first, just as the remaining Commandments make the first explicit. the other articles help us to know God better as he revealed himself progressively to men. “The faithful first profess their belief in God.
From the Catechism of the Catholic Church 198-199