Final answer:
In the Shahnameh, Zoroastrianism is reflected through its influence on Persian literature and art, with the cosmic struggle between good and evil intrinsic to Zoroastrian belief being a central theme.
Step-by-step explanation:
Zoroastrianism is illustrated in the Shahnameh primarily through the influence on ancient Persian literature and art. The Shahnameh, an epic poem that is central to Persian culture, contains references to key Zoroastrian figures, beliefs, and the spiritual justification for Persian imperial expansion. The universal faith of Zoroastrianism with its focus on good deeds and thoughts is depicted through the tales of kings and heroes, embodying the idea of a cosmic struggle between good and evil as represented by Ahura Mazda and Ahriman. Fire, regarded as a holy force within Zoroastrianism, is also a significant symbol in the book's iconography. The themes of the Shahnameh, including courage, ethics, and just rule, align with Zoroastrian beliefs and practices.