I have found only this short review (where the case of the title is also done):
http://www.egodeath.com/JeanMagneEarlyEucharist.htm
In particular, I read:
The gnostic myths often make the paradise account be preceded by an account of a fall of a Sophia, from which the first Archon who created the illusionary world, and its offspring, come forth. Sophia rebukes and punishes the first archon for its arrogance, throwing it down the abysmal Tartaros. One of the offspring, Sabaoth, converts and is rewarded by Sophia with the throne in the seventh heaven.
Thus some later Gnostics divided the archons apart into a good one, Sabaoth, and an evil one, who turns later into Satan, the ruler of the Aion of this world. Note that Genesis puts the Bounty of the angels a few chapters after the paradise snake tale, so the identification of devil, Satan, Lucifer, and the serpent is nowhere near straightforward.
The Jews could not be content with Sabaoth just being a subdeity, but there was a way to reconcile them: Lord Sabaoth of the Gnostic myth was interpreted as the outer face of the Jewish God. Jesus, in a first step, became identified with this repentant archon, thus distinguished from the supreme God. This Jesus appeared in two forms, as a serpent in Paradise and in human shape during the reign of Tiberius. Also, Jesus' father had to be changed from the former archon to the supreme God.
This stage is mirrored in something called pre-Pauline hymn of the epistle to the Philippians, 2:6-11 which underlines the parallels between Paul's Jesus and the Sabaoth of the gnostic myth. Also some other traces of this stadium [?] in the NT, the patristic and liturgical literature are given.
Of course it still offended Jews to have now Sabaoth as a second deity, violating their monotheistic claims. Thus Jesus could not be kept as Lord, but had to be lowered to a different status, and precisely that of the Messiah announced by the prophesies of the Tanakh, as the canonical Gospels now state it. The crucifixion is integrated from its astrological-geometrical [gematrial?] sources. The roman representants [representatives?], the Saducean priests, and Herod adopt the role of the celestial powers.
So far to the development of Jesus from the gnostic roots to Judaised Christianity, as derived from considerations about the holy supper, in the remaining part of the article Magne turns to the second important rite of Christianity, the baptizing ceremony, its development and mythical foundation
If this scholar's view is correct, then I was right, when I said again and again in this forum that Jesus, when he is called "carpenter and son of Mary'' by the blind people of Nazareth, was considered by them the demiurge son of Sophia.
Only that article would make Jean Magne the greatest mythicist of all the times.