Jesus gets to decide.
The mission of the Church is to make disciples.
Sunday school, singing fro song books and buildings, bank accounts, etc. are useful in doing so.
Matthew 28:18–20
[18] And Jesus came and said to them, “All authority in heaven and on earth has been given to me. [19] Go therefore and make disciples of all nations, baptizing them in the name of the Father and of the Son and of the Holy Spirit, [20] teaching them to observe all that I have commanded you. And behold, I am with you always, to the end of the age.” (ESV)
The mission of the church is to build up the saints.
Therefore encourage one another and build one another up, just as you are doing. (Thessalonians 5:11)
So then you are no longer strangers and aliens,
4 but you are fellow citizens with the saints and members of the household of God, built on the foundation of the apostles and prophets,
iChrist Jesus himself being the cornerstone,
kin whom the whole structure, being joined together, grows into
la holy temple in the Lord. you also are being built together into a dwelling place for God by
5 the Spirit. (Eph 2:19-22)
The mission of the church is to be an alternate city to the city of man.
It is to function as an example of what our future lives will be like, as a picture of things to come
“You are the light of the world. A city set on a hill cannot be hidden. (Matt 5:14)