Depends what you mean demonizeYou mischaracterized what she said, and that's not a good look for someone who wants to be seen as a Christian.
She never suggested that "anything she says is true". She said (paraphrased) she's an atheist, no matter what you say.
Christian fundamentalists like to put words into the mouths of the people they're trying to demonize.
That's not in any way fanatical. Again, you're mischaracterizing what she said.
Seems like she was reacting angrily to someone interested in telling her what she thinks. Fundagelicals do that a lot...
That's because you're only seeing what you want to. IIDB is atheistic, but you never even came close to showing it to be cult-like. I suppose if the mischaracterized opinions of one person can be evidence they belong to a cult, then you belong to a cult, too.