Answer: Zoroastrianism is one of the world's oldest known living religions and has its origins in the distant past. It developed about three and a half thousand years ago from the ancient Indo-Iranian religion that was once shared by the ancestors of nomadic herding tribes that later settled in Iran and northern India.
Explanation: According to Parsi tradition, a group of Iranian Zoroastrians emigrated from Persia to escape religious persecution by the Muslim majority after the Arab conquest. Experts speculate that the group sailed across the Arabian Sea and landed in Gujarat, a state in western India, sometime between 785 and 936 A.D. This is how the Zoroastrians came to Persia (Iran) and tried to spread the religion.