[mcv]

There's a lot of ancient stories about a massive flood in that area with someone building a boat and saving animals, so maybe that's a thing that really happened. But it's most likely a massive river (Eufrates & Tigris?) flood or possibly even the filling of the Black Sea deluge[0], and involved mostly farm animals, not lions and kangaroos.

(As a Christian I'm totally comfortable with the idea that some stories in the Bible are just stories and don't have to be literally true.)

[0] https://en.wikipedia.org/wiki/Black_Sea_deluge_hypothesis