Brethren in Christ is a religious term that is used to describe a group of believers who adhere to a particular faith. There are several synonyms that can be used to refer to the Brethren in Christ. One such synonym is "followers of Christ," as they are individuals who follow the teachings of Jesus. Another synonym is "believers," as they have a strong belief in their faith. "Disciples of Christ" is another synonym, as these individuals strive to follow in the footsteps of Jesus and learn from his teachings. Finally, "brethren of the faith" is another synonym that can be used to refer to the Brethren in Christ.