Rabbanist

Example:He is a sectarian who follows the Rabbanist tradition.

Definition:A person who follows a particular sect or a religious, political, or other group.

Example:Some consider Rabbanists to be heretics for deviating from mainstream religious practices.

Definition:A person who has beliefs at odds with the official or generally accepted tenets of a religion, and willfully or stubbornly clings to those beliefs.