Our series on worship includes swaths of the book of Hebrews, particularly chapters 9 and 10 as they outline the extreme effectiveness of Jesus' sacrifice. In contrast to the old system of repeated sacrifices that never fully atoned for sin, Jesus' death on the cross is a one time only, once and for all deal. We are not able to lift a finger to accomplish our own salvation: Jesus has done it ALL.
In doing so, He calls us into a life of connection to Him and others with worship at its center. In contrast with the ritual of the old ways (that many hold onto in a solemn re-sacrifice of Christ either transubstantiationally or effectively so cheapens His all-sufficient act), Jesus has brought radical change to how humans interact with their creator.
AND with one another. The Lamb purchased His people with His blood and made them all priests. A priest is someone who fosters, enables, and facilitates other people's relationship with God. Our primary task in taking part in corporate worship is not to gain "what's in it for me," but rather to seek to be a blessing, a boost, an encouragement to fellow worshippers. The Holy Spirit has fostered His fruit and His gifts in us to bear witness to Jesus first by building up His body. Worship isn't about you, friend; it's about Him, and His body.
To investigate this most important of stories further, go here.