In the Zoroastrian faith, aren’t Good and Evil basically equal in power? Both are eternal principles too, right? I think that they do believe in some sort of soul. I’m not sure what they think happens to it after death.
After death, we all learn what happens. Before death it’s all speculation.
It depends on what sect.
Originally it was clearly dualistic - good (Ahura Mazda - which mean Lord of Light) vs evil (Aingra Mainyu).
Later, under the Sassanid Empire (224 AD to 640 AD) it promoted Ahura Mazda to being the first principle and Mithra vs Aingra Mainyu as dueling twin brothers.
They do believe in souls and a paradise.