Avesta -- Zoroastrian Archives Contents Prev zfaq.html Next Glossary Frequently asked questions on Zoroastrianism and the Avesta WHAT IS ZOROASTRIANISM? A brief overview Zoroastrianism is a religion founded in ancient times by the prophet Zarathushtra, known to the Greeks as Zoroaster. Zoroastrianism was the dominant world religion during the Persian empires (559 BC to 651 AC), and was thus the most powerful world religion at the time of Jesus. It had a major influence on other r ...