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.