Zoroastrian a. : Of or pertaining to Zoroaster, or his religious system.

Zoroastrian n. : A follower of Zoroaster; one who accepts Zoroastrianism.

Example:
What do you think of the Zoroastrian faith?

Taxonomy
Zoroastrian, Zoroastrianism, Iranian, religion, Ahura Mazda, Parsis, texts, Muslim, Sassanid, Boyce, Yasna, druj, Islam, faith, influence, tradition, non-Muslims, Middle Persian.

Defination from the web:
... In Zoroastrian tradition the malevolent is represented by Angra Mainyu (also referred to as "Ahriman"), the "Destructive Principle", while the ...