The Lutheran Church is a liturgical Church. As such, Calvary follows a carefully thought out order of service that has been handed down to us by many centuries worth of Christian worshipers. The typical order of service we use is one way we can ensure that God's service to us through Word and Sacraments remains the chief focus of our time together on Sunday.
As you scan the order of service, note the prevalence of God's grace and mercy to us sinners!
You can find an explanation of the Service here.