Embedded Player Zoroastrianism is one of the world's oldest living faiths. The ancient theology played a large role in the formation of Judaism, Christianity and Islam, and once had millions of followers. But now only about 200,000 people follow the faith. Two Zoroastrians - Journalist Deena Guzder and Professor Jamsheed Choksy - discuss the fundamental tenets of the religion and why it has lost traction throughout the years.