We worship God because God created us to worship him. Worship is at the center of our existence, at the heart of our reason for being. God created us to be his image—an image that would reflect his glory. In fact the whole creation was brought into existence to reflect the divine glory. The psalmist tells us that “the heavens are telling the glory of God; and the firmament proclaims his handiwork” (Ps. 19.1) The apostle Paul in the prayer with which he begins the epistle to the Ephesians makes it clear that God created us to praise him.
Blessed be the God and Father of our Lord Jesus Christ, who has blessed us in Christ with every spiritual blessing in the heavenly places, even as he chose us in him before the foundation of the world, that we should be holy and blameless before him. He destined us in love to be his sons through Jesus Christ, according to the purpose of his will, to the praise of his glorious grace… (Eph. 1:3-6)
This prayer says much about the worship of the earliest Christians. It shows the consciousness that the first Christians has of the ultimate significance of their worship. They understood themselves to have been destined and appointed to live to the praise of God’s glory (Eph. 1:12). When the Westminster Shorter Catechism teaches us, “Man’s chief end is to glorify God and to enjoy him forever,” it gives witness to this same basic principle; God created us to worship him…Worship must above all serve the glory of God.—Hughes Oliphant Old