There's an old hymn that many Christians have sung for nearly a century. "How Great Thou Art" celebrates the glory of God while considering, "all the works thy hands have made." It reminds me of the psalm that reads, "The heavens are telling the glory of God; and the firmament proclaims his handiwork. Day to day pours forth speech, and night to night declares knowledge."
Creation, therefore, is a witness to the wonder and awe of God. Although humanity has been given the honor of bearing God's image, the earth shows God's creativity and ingenuity. Over the years I've heard so many stories of people finding faith in God, not because of brilliant arguments, but because they are in awe of the complexity and glory of the created world.