This is for a novel. I'm trying to get a better understanding of ancient religions, so I can work on my own fictionalized versions of said religions. I won't go into too many details on the story itself, but I'm hoping you guys can teach me some about Zoroastrianism and how it has influenced the Abrahamic Religions. That way, I can work on my own fantasy versions of each religion. All I know is that they heavily emphasize duality and Ahura Mazda is the brother of Ahriman. Also, do they influence Hinduism at all?