Gd: knock knock Me: Who’s there?. Gd: I am. Me: I am who? G*d: I am who I am.
In case you don’t get the joke: “I am who I am” is Exodus 3:14. When Moses asks “Who are you” that’s the answer. It is sometimes translated as “I am that I am”
This is why G*d (and I) thought the joke was funny.
Do you think it’s funnier now that I have explained it?
No?
I guess you had to be there.
In the dream, G*d said She liked “who I am” better, plus, bonus, “it fits the knock-knock joke schema.”
Or maybe I just made that up.