It has been correctly stated that if God is not truly worshiped, He cannot be truly served, no matter how talented, gifted, or well-intended we may try to be. These disciples spontaneously worshiped Jesus because they knew Him well and had spent time with Him from the very first meeting until He ascended into heaven (John 1:38-39; Acts 4:13). Just the sight of their Savior, Lord and Master compelled them to Worship. All the confusion, fear and distractions caused by the religious leaders melted as they saw Him.
We are not told who it was that doubted, but from the context and grammatical construction of this report, they were persons who did not worship when they saw Jesus. Their relationship with the Lord was weak at best and therefore He was not a priority in their lives. Without an active and personal relationship with the Lord Jesus, worship will become a ritual; the heart not truly engaged with the Person who deserves all our worship. Without genuine worship there cannot be a heart for missions. Intimacy with Jesus increases our desire to make Him known to others. After all, missions and carrying the Good News, the Gospel to the unreached is an extension of true worship.
Examine your worship. What does it indicate about your heart for missions.