A businessman, government officials, servants, soldiers. The Bible is full of stories of God using individuals in all sectors of society. While the Levites were a small community of people set aside to help the people worship, much of the work of God in the world unfolded in the everyday arenas of society—in the public square.
Even in the New Testament, with believers spreading out across the Middle East and Asia to spread the gospel, the model was not for these new believers to fully give up their vocations for ministry. Paul continued to make tents. Luke was a physician. By all appearances, Zacchaeus went back to tax collecting (albeit, his vision for that work significantly altered by his new faith). These early Christians diligently spread the gospel—but they also participated in the work of the world.