Since we have nothing of "Yeshua's messages"
except through Christianity, how can there be a
highjacking?
Scholars regularly refer to Q (Quelle=source) a compilation of Jesus' sayings that were used by Gospel writers in constructing their narratives. Since this source no longer exists, it is hard to exactly determine its contents, but a bit of scholarly reverse-engineering on the texts gives people an idea of what, if not all, it probably contained. For example some of the pseudepigrapha may have Q elements, but there is no way of establishing that beyond linguistic conjecture.
The hijacking would then amount to the additions and framing of Q by the Gospel writers as well as the ideological additions made by Paul and other writers of canonical epistles.
"Reframing" might be a better word than "hijacking" but the essence is the same. It's all story-telling...building a story, connecting a story, foreshadowing, incorporating mythic harmony.
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