it is irrational to reject something that one knows nothing about. he is allowed to be irrational just as the fundies are, but it does not make for a good discussion.That wasn't the point of the analogy. The point was that in neither case do you need to be able to name all of the entities in a class to rationally conclude that none of them are real.
Using your analogy. If you claim Bilbo Baggins is God then I will reject your claim because the author of the story never claimed he was. But I don't reject 10,000 gods who I have never heard of as LHA claims because I don't know anything about them. I don't think anyone on the planet even knows 10,000 gods, so he shows he is not sincere.