By saying "exactly," it looks like you're trying to seem like you agree with something I said. But from what you say after that, it is clear that you are not in agreement with anything I've said in this thread. And, I'm not trying to burn you by saying this, but you, clearly, have not understood what I've been saying in this thread. Please don't imagine I'm trying to offend you by saying that; believe me, it's not like I think you, or anyone else, must be mentally deficient for failing, right off the bat, to get what I'm saying. I'm talking about something most people have never thought about, an irrational feature of popular language usage.
In my posts addressed to Smith, I stated that no man is a myth, because a myth is composed of words, whereas (as Smith, himself, even told me) a man is composed of flesh and blood. A man is not composed of words, and a myth is not composed of flesh and blood. No man is a myth; no myth is a man. Smith seems to not have liked it one bit that I stated that no man is a myth, and he obviously lacked the patience to try to understand why I state that no man is a myth, since he chose, instead, to throw abusive language at me, and to stonewall against the questions I was asking him about what he had said. He's apparently laid himself down to sleep at the feet of those "scholars" who promote what he calls "Christ Mythicism," and his reaction to what I've been saying basically amounts to a sign hanging on the door of a bedroom that reads, "Go away! I'm trying to sleep!"
"Father Christmas is a myth"
If, by your phrase, "Father Christmas," you are referring to some man, then, in saying "Father Christmas is a myth," you are expressing a falsehood, since no man is a myth. It is false that some (any) man whom you may happen to be calling "Father Christmas" is a myth, since no man is a myth.
"Father Christmas is a...lie that parents tell their kids."
If, by your phrase, "Father Christmas," you are referring to some man, then, in saying "Father Christmas is a lie," you are expressing a falsehood, since no man is a lie. It is false that some (any) man whom you may happen to be calling "Father Christmas" is a lie, since no man is a lie. A man can lie. A man can be a hardened, shameless liar. But no man is, himself, a lie.
For my part, I do not call any man "Father Christmas," or "Santa Claus." But, again, as I've said, if someone does happen to use the phrase, "Father Christmas," or "Santa Claus," to refer to some man, then, in doing so, since they are referring to a man, they are not referring to a myth.