So, you think it is fine, if person just identifies as something, even without the person even knowing what it means?
They think they know what it means, just like you think you know what it means. You just don't agree with each other.
It's like protestants vs catholics. Neither thinks the other are "real christians (tm)"
Or sunni's vs shiites. Neither thinks the other are "real muslims (tm)".
It's just a no-true-scottsman.
They identify as such and are sincere in their beliefs. That you don't agree with them is just that... you not agreeing with them. They don't agree with you either.
If person would for example say he identifies as a cop, and then arrests you, it would be fine, even if he is not really a cop?
And again with the bad faith argumentation.
A cop is someone with a badge and an official license provided by an official government-mandated organization. It is not a matter of what you "believe".
To compare that with being a follower / believer of a religion, or denomination thereof, is beyond ridiculous.
I think it is ludicrous to think that words have no meanings.
It's even more ridiculous to ignore that there are many different denominations and sects within certain religions.
And that even within the same sects / denominations, there will also be different
sincere interpretations and disagreements about said religions.