I don't think you guys are realizing what Art is getting at. He's thinking that even though she and the other LaVey Satanists claim they don't believe in a real being called Satan that they do in fact worship him regardless of whether they realize it or not (and I think he believes Blanche actually does believe in a living Satan). It leads to the same place.
Except, of course, that 'Satan' as the 'Devil' is entirely a Christian construct and does not exist.
Losing patience with this, tbh. It's turning into an infomercial for orthodox Christianity.