In order to make The Book of John compatible with Judaism, there would need to be a Jewish source claiming that there is only 1 way to approach G-d. And I don't think it exists.
I think that's a justifiable point of view, however in the Qumran self-glorification hymn and in the Similtudes of Enoch, I do think we find 'divine agents' who are qualified as being uniquely exalted and as being incomparable / unparalleled mediators (i.e. with no equal). The SGH speaker declares of himself: "[the other gods/angels] shall not be like my glory (kevodi), and none shall be exalted save me. And who shall measure the flow of my speech, and who shall be my equal, and be like (me) in my judgment?"
In my judgement (pun intended ) - and in the judgement also of a dead sea scholar like James Charlesworth - these sources bear a similarity to the theology in John, not least in in that both texts portrary their respective deified figure as being 'without equal' / the only one so exalted. As I noted with reference to the scholar Fletcher-Louis earlier on:
All the Glory of Adam
"The hymnist declares himself exalted and enthroned in the heavenly realm with an incomparable Glory...The speaker claims that he is now with the gods and that he is incomparable in a way which reminds us of Biblical language for Israel's God (Exodus 15:11: "Who is like you, O Lord, among the gods?")..."
In the Sefer Hekhalot we are told that: "Any angel or any prince who has anything to say in my Presence should go before him [Enoch-Metatron] and speak to him", which implies that Metatron has been appointed the conduit / way to the divine throne for any prince or angel who wishes to say anything in the divine Presence.
In John, I think similarly, we find these words attributed to Jesus: "In my Father’s house there are many dwelling places/rooms. If it were not so, would I have told you that I go to prepare a place for you?...I am the way, and the truth, and the life. No one comes to the Father except through me." (John 14:6).
Is that not passingly similar to Metatron's role in the Sefer Hekhalot and the deified person in the Qumranite SGH?
In fact, I think this association is strengthened by the fact that when Jesus in the above chapter of John (chapter 14) refers to himself as being the 'way' to "My father’s house" where there are "many rooms prepared", scholars such as Adele Reinhartz have written of this: "There may be an allusion here to the Jewish “Hekhalot” (“palaces”) tradition, involving stories in which a seer visits the heavenly realm and explores its different rooms (based on the chariot vision in Ezek 1, and in such works as 1 En. 17, 18)."
So Jesus appears to have been invoking for himself a mediatorial function akin to that exercised by Metatron in the later Hekhalot literature, and indeed Paul arguably testifies to a merkabah vision too, as other Jewish scholars - Alan Segal and Boyarin himself - have noted in relation to his letters:
Merkabah mysticism - Wikipedia
According to Timo Eskola, early Christian theology and discourse was influenced by the Jewish Merkabah tradition.[22] Similarly, Alan Segal and Daniel Boyarin regard Paul the Apostle's accounts of his conversion experience and his ascent to the heavens (2 Corinthians 12:2–4) as the earliest first person accounts we have of a Merkabah mystic in Jewish or Christian literature.
However, I concede that you may be right that "exclusivism" (in terms of Jesus mediation) may be the true substantive difference between early Johannine Christianity and the rest of Second Temple Judaism, as opposed to his description as pre-existent divine mediator (which is attested elsewhere among other Jewish sects, including in the context of a heavenly saviour figure at Qumran, such as Melchizedek or indeed the later Enoch-Metatron in the Hekhalot as a mystical intermediary of the Divine Presence).
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