The church "is not a church."
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You and I and each one of those who make up the body of Christ is endowed with power from the Holy Spirit to go and make disciples of the whole world preaching the gospel.
18 And he is the head of the body, the church, who is the beginning, the firstborn from the dead, so that in all things he may have the preeminence;
Colossians 1:18
When people actually hear the word "church" the first thing they imagine is some kind of building, but the reality is that church is much more than that.
18 You are Peter,[a] and on this rock I will build my church, and the powers of hell will not prevail against it.
Matthew 16:18
Here we can see the Lord Jesus Christ himself speaking of what a church would be, you are talking about something far beyond a structure, the Lord Jesus Christ was referring directly to the body of Christ, of which each believer is a member of that body. Let us remember in the book of Acts that the church began on the day of Pentecost when the Holy Spirit descended to anoint Christians and begin what we call church today, the church extends to our days and the Lord Jesus Christ himself adds new believers day after day.
5 you too are like living stones, with which a spiritual house is being built. In this way you become a holy priesthood, to offer spiritual sacrifices that God accepts through Jesus Christ.
1 Peter 2:5
The main function of the church as a ministry here on earth and as the body of Jesus Christ is through the capacity and power of the Holy Spirit to carry out the work that God has designated, each member of the church has the mission to bring people to the knowledge of the Savior Jesus Christ and make disciples, preaching the word of God and teaching so that each believer grows in the Lord.
19 Therefore go and make disciples of all nations, baptizing them in the name of the Father and of the Son and of the Holy Spirit;
Matthew 28:19