"Can you dig it?"
“Wasn’t this also the major religion of Persia?”
Yes, the religion of Cyrus the Great, who freed the Jews from the Babylonian captivity, and rebuilt the Temple in Jerusalem.
Zoroastrianism is centered around the struggle between good and evil, light and darkness (hence the fires, symbolizing the light and the good). They view the struggle to take place in the universe as a whole, but also within each person, which is a focus of their practice - cultivating good and avoiding evil.
"Can you dig it?"