zoroastrianism
Zoroastrianism is is one of the oldest religions. becasue of this fact there is a problem with assignin even an approcimate date "since zoroastrianism began within a pre-literate culture there is a lack of recorded information about its earliest time. ... (Pangborn 1)" Roots of zoroastrianism can be located in an eastern tribal and basically pastoral society" (encyclopedia of religion) For thousands of years zoroastrianism was the main religion of three persian empire(Achaemenians, the Parthians, and sasanians) zoroastrianism was spread acros asia from greece in the west to india in the east.