He is only performing outwardly, and we will not be excited about that. Worship is part of a whole life-relationship with God. We present our bodies to him each day as our spiritual worship. So we prepare for Sunday services by a daily walk. There is no short-cut to instant worship.
Worship comes from the inner springs of the heart.
The man who believes on Jesus will find that out of his inmost being rivers of living waters flow. In the Sermon on the Mount the Lord Jesus speaks of the importance of inward heart attitudes. So it is impossible to judge the intensity and reality of true worship in an assembly of people. God alone can read their hearts. Worship is a living relationship between ourselves and our God.