It's interesting, Tink! Around 1980, I studied for a time with a very religious woman, a Christian mystic, who had a strong interest in Zoroastrianism. Thus still recalling some of the basics -- the epic struggle between good and evil, Ahura Mazda -- but did not know all this.
Formed ~1500 B.C., that means Zoroastrianism is appx. 1000 years before even Buddhism!
From the article, I am adding that lovely photo of the fire temple at Gujarat, built 1740's:
