First Church in Charlestown is a Congregational church that became a member of the Southern Baptist Convention, and is a part of the 9 Marks Network.
The church has been historically and still is a Congregational church; upon the installation of Rev. Erik Maloy in 2015, the church also became a member of the Southern Baptist Convention through its affiliation with the Baptist Convention of New England. The church is also a part of The Gospel Coalition and 9 Marks networks, as well as one of the cohort churches in Overseed, an organization dedicated to reviving historic New England churches, by returning them to a Gospel preaching view of theology. 
