this is actually an interesting emperor, for example did you know he wrote a letter stating that he wished to promise the restoration of a temple for the jews?
https://avande1.sites.luc.edu/jerusalem/sources/julian-epist-25.htm
he viewed the different religions as hellenism as the best...
Zoroastrianism did not turn them into demons from my understanding, they still worshipped those gods. it has a polytheistic pantheon with a supreme leader.
other forms of paganism do predate it and I completely agree with that part, however @Wotanwarrior was saying that Zoroastrianism predated...
oh and I forgot another thing I should point out, orthodoxy's main goal is to make you also a god, it is called Theosis "https://en.wikipedia.org/wiki/Theosis_(Eastern_Christian_theology)"
so I come from orthodox christianity, and have been wondering specifically about a bunch of the claims on your site. (specifically how judaism stole everything from previous religions)
as for this page, and information, I can objectively state this is not the reason I have chosen orthodox...
so I have been lurking for quite a while, still trying to discern if this is real or not.
so what evidence do you have these are stolen? Zoroastrianism came from about 600 BC, while judaism definitely predated that.