What term describes a religious group whose members bind themselves to one another through a solemn agreement?

The term that describes a religious group whose members bind themselves to one another through a solemn agreement is "Covenant community." This concept reflects a collective commitment among the members to live according to shared beliefs and practices, often formalized through a covenant or solemn agreement. The idea of a covenant is rooted in religious traditions, where it signifies a mutual commitment not only to each other but often to God as well, creating a sense of accountability and community among the members.

While a congregation generally refers to a local assembly of worshippers, it does not necessarily imply the specific binding agreement characteristic of a covenant community. A faith alliance could suggest a partnership among different religious groups, which lacks the intimate connection of a mutual agreement within a single group. Meanwhile, a religious order typically refers to a group bound by specific rules or a way of life, often within a monastic tradition, which may not highlight the emphasis on a mutual commitment found in covenant communities.