Well Zorasterism is as Persian a Persian can be. The surviving believers maybe 50 - 100 thousand (probably too high!) left in Iran. Likewise number in India where they fled after the 6th century Islamic conquest - called Parsees in India. They prefer ( or so be told me!) Zorasterism to be called Auhra Mazdeism ( note probably spelled wrong!) or just Mazdeism. Famous Parsees Zubin Metha & Freddie Mercury.