Christianity and the vast majority of Judaism are both are Grecoroman fanfiction.
Writings from the Library of Alexandria were plagiarized and twisted to provide the vast majority of "history" the Talmud-writers used to pad out the few scraps of Judean myths that had survived several hundred years of neglect as Greece and Rome gradually conquered and embraced Judea. Hebrew was basically extinct by then (100-250BC), with about 8000 words remaining in what was a second or third language to most if not all Judeans at that point
Hebrew was basically a dead language.
The Talmud-writers, a small radical sect of Judaism gained full control of the Judean people's worldview by forging this national mythos encompassing language, historical and strict rules to control its adherents lives. Generally I consider what happened in the 2 centuries BC to be a repeat of the Babylonian Captivity, where Jews that had taken to Babylon culturally were exterminated and replaced by their own zealously xenophobic relatives.
Christianity came along shortly thereafter, basically a sibling religion more than descending from Judaism and it similarly draws deeply on Grecoroman myths. With the two cults working in concert they were able to conquer Rome within a few generations and Europe not long after, they continue this project of eradicating existing cultures to replace them with their own to this day.