The Briticannica entry on the Hellenization of religion has a good summary. These changes happened to many religions which resulted in th eMystery religions which Christianity is also a part of:
https://wwwc.com/topic/Hellenistic-religion/Beliefs-practices-and-institutions
This shows all the Christian concepts come from Hellenism, a trend sweeping through all religions from 300 BC - 100Ad. This is why the "mystery religions" also had dying/rising sons/daughters of their one true God. Like Judaism they started out using Mesopotamian myths and then adopted Greek and Persian myths as well.
-the seasonal drama was homologized to a
soteriology (salvation concept) concerning the destiny, fortune, and salvation of the individual after death.
-his led to a change from concern for a religion of national prosperity to one for individual
salvation, from focus on a particular
ethnic group to concern for every human. The prophet or
saviour replaced the priest and king as the chief religious figure.
-his process was carried further through the identification of the experiences of the soul that was to be saved with the
vicissitudes of a divine but fallen soul, which had to be redeemed by cultic activity and divine intervention. This view is illustrated in the concept of the paradoxical figure of the saved saviour,
salvator salvandus.
-Other deities, who had previously been associated with national destiny (
e.g., Zeus, Yahweh, and Isis), were raised to the status of
transcendent, supreme
-The temples and cult institutions of the various Hellenistic religions were repositories of the knowledge and techniques necessary for
salvation and were the agents of the public worship of a particular deity. In addition, they served an important sociological role. In the new,
cosmopolitan ideology that followed Alexander’s conquests, the old nationalistic and ethnic boundaries had broken down and the problem of religious and social identity had become
acute.
-Most of these groups had regular meetings for a communal meal that served the dual role of
sacramental participation (referring to the use of material elements believed to convey spiritual benefits among the members and with their deity)
-Hellenistic philosophy (Stoicism,
Cynicism, Neo-Aristotelianism, Neo-Pythagoreanism, and Neoplatonism) provided key formulations for
Jewish,
Christian, and
Muslim philosophy,
theology, and
mysticism through the 18th century
- The basic forms of worship of both the Jewish and Christian
communities were heavily influenced in their formative period by Hellenistic practices, and this remains fundamentally unchanged to the present time. Finally, the central religious literature of both traditions—the Jewish
Talmud (an
authoritative compendium of law, lore, and interpretation), the
New Testament, and the later
patristic literature of the early Church Fathers—are characteristic Hellenistic documents both in form and content.
-Other traditions even more radically reinterpreted the ancient figures. The cosmic or seasonal drama was interiorized to refer to the divine
soul within man that must be liberated.
-Each persisted in its native land with little perceptible change save for its becoming linked to
nationalistic or
messianic movements (centring on a deliverer figure)
-and
apocalyptic traditions (referring to a belief in the dramatic intervention of a god in human and natural events)
- Particularly noticeable was the success of a variety of prophets, magicians, and healers—
e.g., John the Baptist, Jesus,
Simon Magus,
Apollonius of Tyana,
Alexander the Paphlagonian, and the cult of the healer Asclepius—whose preaching corresponded to the activities of various Greek and Roman philosophic missionaries
Also baptism and the eucharist were big parts of Greek religions before Christianity. Early Christian apologists told people that yes Jesus was just like all the other savior demigods but that's because the devi; went back in time and made it look that way to fool people.
"
Early apologists admited similarities and blamed them on Satan.
Even allowing for these caveats, it is clear that substantial ideological and ritual similarities did exist. In fact they were sufficiently obvious to the early Christian apologists that they felt obliged to offer some explanation for them, particularly since, to their embarrassment, it was clear that the Mystery rituals predated their own. The most common explanation, offered by many Christian apologists including Firmicus Maternus, Tertullian and Justin Martyr, was that demons had deliberately prefigured Christian sacraments in order to lead people astray. This explanation has sufficed for Christians over countless centuries, and indeed scholastic bias towards the assumed uniqueness, primacy and superiority of Christianity is one of the major methodological pitfalls encountered by those engaged in the comparative study of Christianity and the Mysteries. Many Christian scholars have been so certain that Christianity alone, of all the world’s religions, is an original and unique revelation that at times it seems that they might almost prefer the “demonic intervention” explanation to the unthinkable possibility that Christianity was influenced by its philosophical and theological environs. This paper, however, will seek to explore and quantify the similarities and differences and to offer a more prosaic explanation for them as far as it is possible to do so at such a remove and in the light of the methodological "
Jennifer Uzzell :
The Relationship between Hellenistic Mystery Religions and Early Christianity:
A Case Study using Baptism and Eucharist
The Persian myths included Revelation (a huge battle between good/evil with lots of fire where all good members would be resurrected into new bodies and live in paradise on Earth forever), a virgin born world savior who would save humanity, an eternal war between God/Devil.
as Mary Boyce pointed out on pg 29:
" Historically, the unique features of Zoroastrianism, such as its
monotheism,
[5] messianism, belief in
free will and
judgement after death, conception of
heaven,
hell,
angels, and
demons, among other concepts, may have influenced other religious and philosophical systems, including the
Abrahamic religions and
Gnosticism,
[6][7][8] Northern Buddhism,
[7] and
Greek philosophy.
[9]"
they had the first uncreated God
"
Zoroaster went much further, and in a startling departure from accepted beliefs proclaimed Ahura Mazda to be the one uncreated God, existing eternally, and Creator of all else that is good, including all other beneficent divinities.
"
The modern version of Satan was also from the Persians:
"During the
Second Temple Period, when Jews were living in the
Achaemenid Empire, Judaism was heavily influenced by
Zoroastrianism, the religion of the Achaemenids.
[26][8][27] Jewish conceptions of Satan were impacted by
Angra Mainyu,
[8][28] the Zoroastrian god of evil, darkness, and ignorance.
[8] In "
Mary Boyce is the expert PhD in Zoroastrianism and lived in Iran to understand the religion and scriptiure better.
