God has a mission, and that mission is to create a people who will draw near to communion with him by faith through the means that he has provided in the sacrificial atonement of his Son. As part of that mission, God has tasked the New Testament Church to help make disciple-worshipers through the proclamation of the gospel and teaching of his commandments. Corporate worship helps accomplish this mission, not by attracting unbelievers through “relevant” services or even through “contextualizing” the gospel message in cultural forms that are most appealing to unbelievers. Rather, corporate worship accomplishes the mission of God by being what it is—worship; the most missional worship is that which acts out the gospel and communicates God’s truth using forms that are regulated by the authority of the Word of God.
If churches would return to this kind of corporate worship, they might see more examples of what Paul hoped for the Corinthian church when an unbeliever witnessed their worship:
He is convicted by all, he is called to account by all, the secrets of his heart are disclosed, and so, falling on his face, he will worship God and declare that God is really among you. (1 Cor 14:24–25)