I recently heard a sermon that addressed the purpose of the Christian life. The emphasis was on being a witness. While I agree that there is a calling for every Christian to witness to his faith in Jesus Christ, that is not our primary purpose.
Our primary calling as believers is to worship and glorify God. Jesus' words to the woman at the well in John 4 clearly notes that God is seeking worshippers (John 4:23-24). Worship means to "ascribe worth to" and means to prostrate oneself before a holy God. It is more than what transpires for an hour or more on the Lord's Day. It is the continuing act of living holy, separated lives before our Sovereign Lord. It is handling every situation in life with the mind of Christ and the spirit of Christ controlling our thoughts, emotions and actions. We cannot put our Christian experience into compartments with some labeled for self and others labeled for God. Everything is His from our most intimate thoughts to our most public moments.
There has been no time in history when it has been more important for believers to understand what it means to worship God. The Westminster Confession begins by reminding us that the whole duty of man is to worship God and to enjoy Him forever. That is a life experience that makes each moment sacred and lived in the presence of God.