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Perhaps my word choice was poor. I'm quite impressed by the mystical origins model of the faith. Belief of a revelatory mystical event would be regarded as 'historical' by those so convinced. Perhaps I should have used expressions like earthbound or material.
There seems two points that bear mentioning, one that earliest Christians could have, and I suspect they did, understood the death and resurrection very differently. Before the Gospel narrative tradition that fleshed out the Christ in recent corporeal terms, the drama may have been thought of as happening in the spirit realm. Pre-Christian texts betray a belief that the heavens were a mirror of the earth in ways that seem foreign to us. The ascension of Isaiah is a marvelous peek into pre-Orthodox thought and there we find the simple expression" “As above, so below". The multilevel heavens included scenes much like the earth, trees grew there, and in fact the tree of life was thought to be there. Also, heavenly spirits were busy conducting sacrifices to God on an alter in heaven. Given these facts, it is not a stretch to think the death and rising up was an entirely, or mostly, heavenly drama.
The Ascension of Isaiah is a marvelous find, apart from some rather obvious later edits, reveals a Christianity completely without the Gospel narrative. The Christ descends through the layers of heaven unrecognized by the spirits of heaven and below.
10:
8 “Go out and descend through all the heavens. You shall descend through the firmament and through that world as far as the angel who (is) in Sheol, but you shall not go as far as Perdition.
9 And you shall make your likeness like that of all who (are) in the five heavens,
10 and you shall take care to make your form like that of the angels of the firmament and also (like that) of the angels who (are) in Sheol.
11 And none of the angels of that world shall know that you (are) Lord with me of the seven heavens and of their angels. And they shall not know that you (are) with me
12 when with the voice of the heavens I summon you, and their angels and their lights, and when I lift up (my voice) to the sixth heaven, that you may judge and destroy the princes and the angels and the gods of that world, and the world which is ruled by them,...
9:14 And the god of that world will stretch out [his hand against the Son], and they will lay their hands upon him andhang him upon a tree, not knowing who he is.
15 And thus his descent, as you will see, will be concealed even from the heavens so that it will not be known who he is.
16 And when he has plundered the angel of death, he will rise on the third day
This certainly reminds us of 1 Cor 2:8
None of the rulers of this age understood it, for if they had, they would not have crucified the Lord of glory.
Apart from a few suspect passages and the insertion of a doxological hymn, Paul in the most probably authentic works offers us nothing about the years Jesus was to have spent on earth, nor does he show any interest in interviewing those who the Gospels (not written yet) describe as intimate associates. Rather he declares and swears he learned nothing from anyone else, but only through revelation and visions when he was taken to what he assumes was "the third heaven".
Paul seems to reflect a Christology more akin to Ascension of Isaiah than the Gospels.
Secondly, the intertextual nature of the Gospel narrative betrays the source of these stories was not collective memory but typological pesher of OT stories. I used to use the term Midrash-like but learned some Jews are passionately protective of the expression.
For a sample of this process, some years ago Leolaia put together a marvelous composition identifying the ingredients to the Judas betrayal and arrest.
So while undoubtedly you are correct that death and resurrection of Christ was a pivotal break from the Jewish precedents, it was likely inspired by a growing interest in martyrdom and suffering prophets of old as well as other mystery faiths featuring a similar sense of divinity and sacrifice. I'm not going to invite criticism regarding direct links between Christianity and other Mystery faiths as I'm aware of the overstated popular suggestions of copycatting. It would however be a mistake to overlook the cultural realities of the day.
I'm sure none of this will persuade someone convinced their faith represents the 'one truth faith', but for me it fits the facts and certainly offers an explanation for Paul's statements of faith and works like the Ascn. of Isaiah and the many Gnostic forms of Christianity.