Ask what a congregation gathers to do, and the answer is instant and universal: to worship. The worship service. The worship leader. The worship team. The order of worship. The word isn't one description among several; it's the name of the thing.
And the New Testament never uses it that way.
This isn't a quibble about vocabulary. The purpose of a meeting determines its shape. If the assembly exists to render worship to God through designated people, then a room where a few perform and many receive is a reasonable arrangement. If the assembly exists to build up the people present, by their action on one another, that arrangement is structurally incapable of its purpose. So the question of what the gathering is for has to be settled first — and Scripture settles it.
The worship words, and where they are used
The primary Greek word translated "worship" is proskyneo. It means to prostrate oneself — a physical act, falling down before someone. In the Gospels it's what people do when they meet Jesus: the wise men (Matthew 2:11), the leper (Matthew 8:2), the disciples in the boat (Matthew 14:33). In Revelation it's what happens before the throne (Revelation 4:10; 5:14). Studied across the New Testament and the Greek Old Testament, it appears hundreds of times.
It's never used of what Christians do when they assemble.
The one place it comes near an assembly is instructive. In 1 Corinthians 14, Paul describes an unbeliever entering a gathering where the members are prophesying, being convicted, and falling down on his face he will worship God (14:25). The assembly's activity is prophecy — edification. The prostration is the outsider's spontaneous response to it.
The second family of words is latreuo and leitourgeo — priestly and sacrificial service. Where the New Testament applies these to Christians, it applies them to all of life:
I beseech you therefore, brethren, by the mercies of God, that ye present your bodies a living sacrifice, holy, acceptable unto God, which is your reasonable service. (Romans 12:1)
Reasonable service is logike latreia — your rational worship. Not the meeting. The body, presented, continuously. Hebrews says the same: let us have grace, whereby we may serve God acceptably with reverence and godly fear (Hebrews 12:28) — a description of a life, not an hour.
The closest text to an assembly is Acts 13:2, where five named prophets and teachers at Antioch ministered to the Lord, and fasted. It describes the activity of five men in priestly-service language, not the gathering of a church.
This is the claim, and it's narrow and verifiable with a concordance: in the New Testament, worship is what a Christian does with his life. It isn't the name of the meeting.
What the meeting is called instead
That would be merely interesting if the New Testament were silent about the meeting's purpose. It isn't silent. It states the purpose repeatedly, in one word, and the word is oikodome — building up, edification.
The longest treatment of a Christian assembly anywhere in Scripture is 1 Corinthians 14, and it's organized around that word from beginning to end:
He that prophesieth edifieth the church. (14:4)
Seek that ye may excel to the edifying of the church. (14:12)
How is it then, brethren? when ye come together, every one of you hath a psalm, hath a doctrine, hath a tongue, hath a revelation, hath an interpretation. Let all things be done unto edifying. (14:26)
For ye may all prophesy one by one, that all may learn, and all may be comforted. (14:31)
Every regulation in the chapter is justified by whether it builds up the people present. Tongues without interpretation are restricted — not because they're illegitimate, but because the church receiveth no edifying (14:5). Prophecy is preferred because it speaketh unto men to edification, and exhortation, and comfort (14:3). The criterion is stated eight times.
And note the word's root. Oikodome is built on oikos — a house. Edification is house-building. The assembly's purpose is described as constructing the household.
Even the singing faces sideways
Someone will object: surely singing is worship. And singing is commanded. But look at how the New Testament describes its direction:
Speaking to yourselves in psalms and hymns and spiritual songs, singing and making melody in your heart to the Lord. (Ephesians 5:19)
Let the word of Christ dwell in you richly in all wisdom; teaching and admonishing one another in psalms and hymns and spiritual songs. (Colossians 3:16)
Speaking to yourselves. Teaching and admonishing one another. The singing is addressed to each other — with the melody rising to the Lord from the heart. Even the singing is edification. It's one of the ways the members build one another up.
And the one text that tells us why not to forsake the assembly gives the same reason:
And let's consider one another to provoke unto love and to good works: not forsaking the assembling of ourselves together, as the manner of some is; but exhorting one another. (Hebrews 10:24-25)
We assemble to consider one another and to exhort one another. The verbs are reciprocal. The purpose is mutual.
Why this reorganizes everything
Look at what follows from getting this right.
If the assembly's purpose were worship — a service rendered to God by the congregation through designated people — then a room in which most people receive and a few perform is a reasonable arrangement. The performance is the offering. The congregation's part is attendance and assent.
If the assembly's purpose is edification — the building up of the people present, by one another — then that arrangement is structurally incapable of its purpose. You can't build up four hundred people by having one speak. Edification is reciprocal by definition; the word describes what members do to each other. And a reciprocal purpose requires a reciprocal form.
That's why 1 Corinthians 14 looks the way it does: many contributing, each one bringing something, the assembly weighing what's said (let the other judge, 14:29), turn-taking regulated because there are too many speakers rather than too few. The form follows the purpose, and the purpose is stated.
What this is not saying
This isn't a claim that God is absent from the assembly, or that praise and prayer are illegitimate. Prayer is commanded in the gathering (1 Timothy 2:1-8). Singing is commanded. The Lord's Supper is commanded. God is honored in the assembly.
It's a claim about what the meeting is aimed at. And the aim is stated: let all things be done unto edifying.
Nor is it a claim that the modern church is insincere. The people who sing on Sunday mean it. The vocabulary of "worship service" was inherited, not invented, and it came with buildings and orders and roles that made sense of it.
But the vocabulary has concealed something for centuries. It has made the passive congregation look like a worshipping congregation, when the New Testament would call it an unedified one.
The test for your gathering
So run one test. At your next assembly, count how many people did something that built up someone else — spoke, taught, prayed aloud for another, confessed, encouraged, corrected, brought a word. Not how many attended. How many edified.
Then compare the number to every one of you (1 Corinthians 14:26).
If the answer is one or two out of hundreds, the gathering may be many things. By the New Testament's own criterion, it isn't yet doing what a gathering is for. And the recovery doesn't begin with a new worship style. It begins with a smaller room, a table, and the restoration of the one word the text uses for the meeting: oikodome. Build the house.