"Christianity in particular has a history of absorbing other religions’ traditions" -- Tangentially related: I'm a Catholic, so I don't know much about other "distros", but the Roman Catholic Church has a long, pragmatic history of absorbing local traditions in Indonesia.
It's interesting dynamic. Catholic Church is notoriously top-down and hierarchical, yet local parishes can feel entirely distinct. It's not uncommon to see traditional Javanese processions integrated right into the mass. Like skin/mod in a game.
I really don't think that that use of "in particular" is correct or notable? Cross culture motion of mythology and storytelling is the rule with humanity, not the exception.
Really it's only in the last/final generation of religions, where they started writing them down in canon/scripture/testaments/writs/dogmas/whatever, that you started to see unique stories get associated with specific religions.
Before that? It's all mush. Aphrodite descends pretty clearly from the same line as Astarte/Ishtar/Innana (maybe Isis too), etc... People steal good stories. People get conquered and then confused by retelling the stories their new overlords tell. Again and again.