All cultures throughout human history have developed mythologies to answer the questions of origins: where did the world come from? Where is it going and how will it end? Where did man come from and why is he different from the other animals? This longing to know is part of man’s nature, as Aristotle says, “All men by nature desire to know” (Metaphysics, I).
The existence of creation testifies to the existence and power of God. “The heavens proclaim the glory of God, and the firmament declares His handiwork” the Scriptures tell us (Ps. 19:1).
It is important to acknowledge that God was in no way constrained to create: He has existed from all eternity as infinite blissful communion between the Father, Son and Holy Spirit. It is wrong to imagine that God needed to create the universe because He was lonely or to increase His glory or otherwise suffered some lack (Acts 17.25). He would have been just as blissful, loving and glorious had He chose never to create at all.
For Discussion: Why Did God Create? Creatio ex Nihilo, A Trinitarian Work, Providence: God Sustains Creation, the Goodness of Creation, Angels, Mankind, Demons, the "Fall," Original sin and Concupiscence, Evolution & Genesis,