You think these scriptures don't speak of God of Israel influencing Persian king?
And in the first year of Cyrus the king of Persia, in order to accomplish the word of Jehovah in the mouth of Jeremiah, Jehovah awakened the spirit of Cyrus the king of Persia, and he caused a voice to pass throughout all his kingdom, and also in writing, saying, So says Cyrus the king of Persia, Jehovah the God of the heavens has given to me all the kingdoms of the earth, and He has laid a charge on me to build a house in Jerusalem to Him, that is in Judah. Who is among you of all His people? May Jehovah his God be with him, and let him go up.
2 Chr. 36:22-23
So says Jehovah to His anointed, to Cyrus, whom I have seized by his right hand, to subdue nations before him. Yea, I will open the loins of kings, to open the two leaved doors before him, and the gates shall not be shut.
Isa. 45:1
Why do you feel that I think that? Yahweh praises Cyrus and calls him a servant of Yahweh. Because the Persians were good to the Israelites.
Now this has no bearing on anything. The Persians did indeed have myths that were not in Judaism and after the occupation, they were part of Judaism. That isn't complicated. Dr John Collins does some really good Divinity lectures about evidence of influence, but it's not hard to see.
Mary Boyce mentions Cyrus as well:
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1st Persian influence on Judaism
Cyrus' actions were, moreover, those of a loyal Mazda-worshipper, in that he sought to govern his vast new empire justly and well, in accordance with asha. He made no attempt, however, to impose the Iranian religion on his alien subjects - indeed it would have been wholly impractical to attempt it, in view of their numbers, and the antiquity of their own faiths - but rather encouraged them to live orderly and devout lives according to their own tenets. Among the many anarya who experienced his statesmanlike kindness were the Jews, whom he permitted to return from exile in Babylon and to rebuild the temple in Jerusalem. This was only one of many liberal acts recorded of Cyrus, but it was of particular moment for the religious history of mankind; for the Jews entertained warm feelings thereafter for the Persians, and
this made them the more receptive to Zoroastrian influences. Cyrus • himself is hailed by 'Second Isaiah' (a nameless prophet of the Exilic period) as a messiah, that is, one who acted in Yahweh's name and with his authority. 'Behold my servant whom I uphold' (Yahweh himself is represented as saying). '(Cyrus) will bring forth justice to the nations. . . . He will not fail . . . till he has established justice in the earth' (Isaiah 42. I, 4). The same prophet celebrates Yahweh for the first time in Jewish literature as Creator, as Ahura Mazda had been celebrated by Zoroaster: 'I, Yahweh, who created all things ... I made the earth, and created man on it .... Let the skies rain down justice ... I, Yahweh, have created it' (Isaiah 44.24, 45. 8, 12). The parallels with Zoroastrian doctrine and scripture are so striking that these verses have been taken to represent the first imprint of that influence which Zoroastrianism was to exert so powerfully on postExilic Judaism. "
But the Persians already had a religion with saviors (virgin born), the Revelation myth, freewill for humans to choose good over bad, God being uncreated and many other ideas that then found their way into Christianity.
The scripture doesn't say Yahweh told Cyrus theological secrets that he has never told any Israelite, that would be ridiculous.
The influence on Judaism and Christianity, from Mary Boyce's perspective"
Doctrines
fundamental doctrines became disseminated throughout the region, from Egypt to the Black Sea: namely that there is a supreme God who is the Creator; that an evil power exists which is opposed to him, and not under his control; that he has emanated many lesser divinities to help combat this power; that he has created this world for a purpose, and that in its present state it will have an end; that this end will be heralded by the coming of a cosmic Saviour, who will help to bring it about; that meantime heaven and hell exist, with an individual judgment to decide the fate of each soul at death; that at the end of time there will be a resurrection of the dead and a Last Judgment, with annihilation of the wicked; and that thereafter the kingdom of God will come upon earth, and the righteous will enter into it as into a garden (a Persian word for which is 'paradise'), and be happy there in the presence of God for ever, immortal themselves in body as well as soul. These doctrines all came to be adopted by various Jewish schools in the post-Exilic period, for the Jews were one of the peoples, it seems, most open to Zoroastrian influences - a tiny minority, holding staunchly to their own beliefs, but evidently admiring their Persian benefactors, and finding congenial elements in their faith. Worship of the one supreme God, and belief in the coming of a Messiah or Saviour, together with adherence to a way of life which combined moral and spiritual aspirations with a strict code of behaviour (including purity laws) were all matters in which Judaism and Zoroastrianism were in harmony; and it was this harmony, it seems, reinforced by the respect of a subject people for a great protective power, which allowed Zoroastrian doctrines to exert their influence. The extent of this influence is best attested, however, by Jewish writings of the Parthian period, when Christianity and the Gnostic faiths, as well as northern Buddhism, all likewise bore witness to the profound effect: which Zoroaster's teachings had had throughout the lands of the Achaernenian empire."