What are some differences between Zoroastrianism or Parsiism and Islam?

Answer 1

Simply put Zoroastrianism centres on Ahura Mazda, the Wise Lord, who was revealed by the prophet Zoroaster / Zarathustra. Zoroaster is generally accepted as an historical figure, but dating just when Zoroaster lived is fraught with difficulty. The most widely accepted calculations place him near to 1200 BCE thus making him a candidate for the 'founder of the earliest religion based on revealed scripture' while there are other estimates that date his life anywhere between the 18th and the 6th centuries BCE.

There are a number of books written by various Zoroastrians about Zoroaster but he himself only penned a series of poems called the Gathas.

Islam centres on Allah who was revealed by the prophet Muhammad around 650 CE, Islam centres on a book, the Qur'an and on a series of teachings derived from the sayings and actions of Muhammad, the Sunna.