There is another common characteristic between the lives of Jesus and Zoroaster...
There is another common characteristic between the lives of Jesus and Zoroaster; the history of Christianity shows that Jesus was ordained as a prophet at the age of thirty. It is said that Zoroaster, too, rose at the same age as a reformer to correct the Mizda'i code by the order of Ahura-Mizda.
Before the rise of Zoroaster, according to the available testimonials of history a class named the Magi held responsibility for religious practices in Iran especially in Azarbayjan, as keepers of the fires. It is has been said that Zoroaster himself was at first either of the Magi class or in contact with them and had even wished to become a Magus. There is a frequent mention of Magus and Magi in the Achaemenid inscriptions, but no mention is made of Zororaster.
In Zororaster's hymns, called 'Gathas', no mention has been made of the Magi except in one place, and no mention is made of Darius and Achaemenids at all. Thus it is not clear for us whether the religion in the time of the Achaemenids and Darius' era had been Mizda'i faith or zoroastrianism or different schools of Budaism.
What is certain, however, is that Judaism had existed as a religion and then had been patronised by Darius.[^30] This point is mentioned in the Jewish holy books as well as historical records.[^31] What also appears certain is that in those days in 'he realm of Iran various faiths had been prevalent, and there may not have been a formal or a state religion as such especially since no mention is made of Zoroaster in the inscriptions of Darius, nor has there been a mention of the Achaemenids in the 'Gathas'.
This could lead us to deduce that state and religion had separate existence, allowing people to practice their own religion and letting the government proceed with its own function. It is in the Sassanid period that religion gains the government' s support and there is a state it became the religion of the country. This aspect warrants an exclusive and objective study of the Sassanid period since it is closely related to the age of the rise of Islam.
To sum up, this eastern neighbour of Arabia was twelve centuries ahead of Arabia, the birthplace of Islam, in extent, greatness, power, natural resources, social, technical and administrative progress and attainment of central governmental organisation and also historical precedence.