score:1
The fact that Cyrus worshiped a different god than the God of the bible is found in
Isaiah 45:1-4 KJV
Thus saith the Lord to his anointed, to Cyrus, whose right hand I have holden, to subdue nations before him; and I will loose the loins of kings, to open before him the two leaved gates; and the gates shall not be shut;
I will go before thee, and make the crooked places straight: I will break in pieces the gates of brass, and cut in sunder the bars of iron:
And I will give thee the treasures of darkness, and hidden riches of secret places, that thou mayest know that I, the Lord, which call thee by thy name, am the God of Israel.
For Jacob my servant's sake, and Israel mine elect, I have even called thee by thy name: I have surnamed thee, though thou hast not known me.
While I do not understand how or why God would speak someone who worshiped a different god, apparently he did.
Upvote:2
Let's try to address all the questions here.
In any case, none of this implies that Cyrus was a worshipper of God by virtue of his being a Zoroastrian (assuming he was - it's far from certain) and thus doesn't imply that the Zoroastrian God is Yahweh.