Ebionitist

Example:He was a zealot for his own interpretation of Christianity, adhering strictly to traditional practices.

Definition:A person who is extreme in their adherence to a cause or belief, often to the point of intolerance or violence. In the context of early Christianity, a zealot might refer to someone deeply committed to their own interpretation of religious practices.

Example:They believed he was a heretic for his rejection of orthodox Christian doctrine.

Definition:A person who rejects the orthodox or official doctrine of a church, religion, or other organization. A heretic in the context of Christianity might emphasize their differences with mainstream beliefs.