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Most of our knowlage about religious idea of non Arian Iranians who lived before history is obtained from what has discoverd from their graves. Obtained things indicate of their deep belief to the after death life.
Most of the orient nations, clans espicially the Iranian plateau believed that souls of the dead bodies after the death would participate in their lives. NonArian Iranians even before Zarathusthra have prasied some goddess. Goddess of science had a espicial importance among them.
Bybylonian writers by cas site hand writing on a clay tablet has expressed name of Cassiten kings dynasty. In the millenium of B.C. and before Zarathusthra appearance, nonArian people belived to Magis religion. After, collapse of Madian empire, they enjoyed from a very good situation in Achememid government system.
Indeed nonArian Iranians were civilized, religious and noble-birth people. So, kings of Pishdady dynasty were respectable as prophet of Israel children, thay belived to religions which were offered from prophets of Israel children and Zarathusthra, the Iranian prophet.