The Christian tradition assigns premacy to a Semitic deity in the sense that the geneology of Jesus traces back to Sem, one of the three sons of Noah, and the patriarch of the Semitic race. The other two sons Japhet and Ham being the patriarchs of the Gentiles and Hamites, respectively.
You should not use mythology as the basis of what you call a Gentile or Aryan. Japhet, Sem, Ham, and Noah are mythological figures for whom there is no evidence. All non-Semites are not just Aryans, but also include Finnish, Turks, Mongols, Arctic Siberians, Native Americans (north and south), Chinese, Malays, Polynesians, New Guineans, Aboriginal Australians, South India Dravidians, and a wide diversity of Sub-Saharan Africans with more genetic variations than all non-Africans put together.
The term, Gentile, is synonymous with the term Aryan, which is in turn synonymous with the term Indo-European. The Iranians, Indians, Greeks, Italic, Celtic, Germanic, Armenian, Slavic, and Albanian people are included within the Indo-European or Aryan family of speakers.
Keep in mind the Indo-Europeans conquered and mingled genetically with non-Aryan peoples across Europe, Iran, and India. I am Celtic (Scottish with 25% Irish family lines.) However, there were already people living in the British Isles long before the arrival of the Indo-European Celts. They are grouped as the Maglamose and Monument Builders. They have excavated Irish villages some 8000 years old. The ancient ruins of Skara Brae in the Orkney Islands of Scotland, Stonehenge, Dolmen burial sites, and standing phallic stones predate the Bible mythology. The Indo-European Celts did not invade until 1800 BCE. Over the next four millennia, they interbred with the pre-Celtic non-Indo-Europeans of Britain and Ireland. Indo-European is more of a language group than a racial or ethnic entitity.
All the aforesaid subfamilies posses a religous heritage. Among them the Iranians bear the oldest religous heritage. One very similar to Christianity in that the one God of these Aryans was a loving and ethical God in contrast to the merciless God of the Hebrew Bible.
The original Indo-Europeans living north of the Black Sea had a religion of which little is known except by its evolutions in those who migrated. Those who migrated east were the Tocharians, Iranians, Medes, Parthians, Mitanni, Kurds, Pashtuns, Aryans who conquered India, and Kushans.
Those who migrated west were the Celto-Ligurians, Latins, Illyrians, Teutons, Slavs, Balts, Greeks, Hittites, Thracians, Luvians, Phrygians, Lydians, Cappadocians, and Cilicians. The group who remained in the plains of Southern Russia, and Central Asia included the Scyths, Cimmerians, Sarmations, and Iasgians.
The religous heritage of the Aryans other than that of the Irano-Aryans was paganistic and did not account for ethics as with the gods of Greco-Roman religion.
The major theme of the Indo-Europeans was Divine Trinities. An example is Iranian Zoroastrians who had a Father God, Ahura Mazda (or Ormuzd), a son of God called Mithras or Mithra (who was also the Sun God or God of Light. They had a Holy Spirit named in ancient Farsi as Spenta Maingu, which means Holy Spirit.
Celts had a Father God, Dagda with a son of Dagda called Lugh or Lieu (also a Sun God or God of Light.) Instead of a Holy Spirit, they had a female Earth Goddess called Danu, or Brigit. Her name variants here are D'Ana, Ana, Anna, and Anu. The similarity in descriptions between Danu and Tana/Diana is remarkable,) Christianity is an Indo-European Religion in every way. It has the High God the Father, Jesus the son of the Father God (also a Sun God), and a Holy Spirit or Holy Ghost. In the place of the Celtic Domnu/Danu/Brigit, Greek Gaia/Diana, and Tana or Tara in India, Romans invented Mary.
Christianity is very tenuously linked to the Jews. The first Jesus followers did not consider him a God. It was Pagan Romans and Greeks who added some Jewish names. They substituted Jesus (Yeshua) for the Irish Celtic Lugh, Gaulish Celtic Lieu, Teutonic Baldur, and the Zoroastrian Sun God, Mithras, and Greek Apollo. Christianity inherited an Indo-European Trinity which they jumbled up saying One God (which Jesus preached) but divided that so-called One God into three on the Indo-European model and a Female Earth Goddess was filled with the Virgin Mary.
The question remains: why did these Aryans and the rest of the Irano-Aryans come to adopt a newly invented non-Aryan ethical tradition when an ethical Aryan tradition was already in existence?
In the fourth Century, Jesus followers never prospered because they did not proselytize. Pagan converts already steeped in a variety of Indo-European religions, felt the need for Jesus to become a God like the Sun Gods or Sons of God of the Indo-Europeans. (There is no significance to the English words Sun and son sounding alike.)
Constantine, Emperor of a reunited Empire decided to merge all Roman subjects into a hybrid religion. Romans had already deified Jesus into a son of God, created by God by impregnating a Human Virgin, Mary. They added the Mithraic or Zoroastrian Holy Spirit / Spenta Maingu. Jesus was originally subordinate to God the Father. Later more Paganisation elevated Jesus to a full God (apotheosis). Athanasius tried to fuse this Pagan Trinity believe into a disingenuous Monotheistic God with three persons or three personalities. It never made sense but people were told that they were too stupid to understand 3+1=1, 1+3=1.which is plainly irrational. Constantine wanted to end the flurry of Civil Wars, which were weakening the Roman Empire. He called the bishops to Nicaea where he supported the Athanasian Trinitarians and outlawed all of the Arians, and Jewish followers, as well as the Pagans hoping to fuse all religions of the Empire into Catholic Christianity. He changed the Jewish Sabbath to the Indo-European Sun day, or Sunday. Sunday was the birth of the Sun God, now Jesus. In addition, the Winter Solstice Dec. 25 on old calendar was the day of Jesus (and Mithra, Lugh, Lieu, Baldur, etc.)
It was all politics as usual.
Amergin