Adherent (noun)

1. A person who supports a particular party, belief, or person.
2. A person who follows the teachings or methods of a particular individual or group.

Origin:

From latin adhærere, meaning "to stick to".

Examples:

1. The church had a small but devoted group of adherents.
2. He became an adherent of the socialist movement.
3. The new political party quickly gained a large number of adherents.
4. He was an adherent of the spiritual leader's teachings.
5. Adherents of the movement gathered for a rally in the city center.