In the context you are referring too, I rather understand identity as class, as in: I belong to these classes: Nostr user, English speaker, and so on. Do you believe in classes?
Discussion
I don't believe in classes. They are fictional boxes that we imagine and talk about. I'm not saying it is not useful to imagine and talk about classes... e.g. the "noble gasses". I'm just reminding everybody that they don't actually exist except as fictions we construct.
Now do object oriented programming 😁
Oxygen breather?
By considering the class of oxygen breathers and assigning an identity to them all (I presume all animals breathe oxygen), you are imagining a division among an undivided universe. A useful fiction. "Naming is the source of all particular things" -Buddha
Sorry that was Laozi (Lao Tsu) who wrote "The unnamable is the eternally real. Naming is the origin of all particular things."
The Tao Te Ching 道德经 is as close as I get to religion/spirituality. It's just a perspective though, libertarian, stoic.
"Governing a large country is like frying a small fish. You spoil it with too much poking."
Socially reinforced fictional constructs at that.
That’s not to say that in broad terms they have some validity.