I have a soft spot for pre-Islamic Iranian culture, although I don’t have a lot of primary sources on Zoroastrianism.
I considered the faith to be equally valid to the Judaeo-Christian spectrum as well. Perhaps Zoroaster was to be the Moses of the Indo-Europeans for YHWH/Ohrmazd in a sense. To enlighten the people from Paganism.
My biggest hope is that one day a complete text of the Avesta will be discovered like the Dead Sea Scrolls. I find it very sad that the faith’s scriptures are only fragments of its true splendor.
For the Z part, much of the original will never be found.
There was much original documentation archived during the Sassanid period. They were mostly lost after Arab and Mongol invasions of Iran, who destroyed libraries, particularly & initially after Arab invasion.
Much of those original Z sources we now possess, were secretly kept by Mobeds (Zoroastrian priests), many of whom were killed to protect them. Others or duplicates were kept surprisingly by ordinary peasants (not aristocracy, nobility or clergy of that time).
Foreign invasions also led many Zs to recite & memorize much of the authentic teachings, and then ensure they were passed on through generations by 'oral tradition', to avoid complete destruction.
"Oral tradition" to ensure continuity is why one sees a Kurd or Tajik can recite traditional poems, such as the ones by Ferdowsi from centuries ago, by heart & from memory, with considerable accuracy, even in the last 30 or 40 yrs. Equally, the Zoroastrian priests today recite without reading from a book.
Fortunately, fact that the Gathas (original 17 hymns by Zoroaster) was Not in prose but poetry form, helped as well to preserve that continuity as much as possible. It was a linguistic and literary advantage.
>>”although I don’t have a lot of primary sources on Zoroastrianism.”<<
If/when you have time, explore this site gradually.
It has a lot of info & related photos. It’s periodically updated too, and the site is managed by a Zoroastrian “Parsi” from India.
http://www.heritageinstitute.com/zoroastrianism/