Persian metaphysics has more philosophical depth than Semitic metaphysics. The West should have become influenced by Persian philosophical traditions during Sassanian era. Byzantines & Bedouins, who were really no different from each another, should have been destroyed and forced to adopt Zoroastrianism.
The way I interpret the dialectic of Zoroastrian religions, which includes Zurvanism, traditional Mazdayasna, Manichaeism, Mazdakism, and Reformed Zoroastrianism, is they begin their metaphysics by establishing two basic principles: good (asha/order/truth) and evil (druj/chaos/lie). However, different sects treat it differently, with Zurvanism notably deconstructing it.
They speak in metaphor about their relation:
Zurvanism: good and evil ultimately do not exist in Zurvan (Infinite Time), but in our relative plain of this realm, we are completely dominated by the illusory dualistic struggle of Ahriman and Ahura Mazda (twins).
Mazdaysna: good and evil have absolute distinction and do not intermix, and life is a progressive movement to alignment with the good (Frashokereti). There is only one true way irrespective of our perspective towards it.
Manichaeism: good and evil intermix and one should liberate the good, minimize the evil VIA asceticism and compassion. They were vegetarian and antinatalist.
Mazdakism: good and evil intermix and one should liberate the good, minimize the evil VIA social activism and compassion. They were vegetarian but natalist.
Reformed Zoroastrianism (due to interactions with Abrahamic filth): evil is not ultimately real/existent, but it is only the absence of the Good or an omnipotent, all-knowing, monotheist God. This has the Problem of Evil.