Didn't believe much in Heaven or Hell? Was there not a demon standing right before her? Certainly that should put a bit of belief in at least Hell in her. If not more. Of some kind of creator or higher power. It just made sense.
Then again, Crowley couldn't complain. He was doing his work, whether she believed in higher powers and ineffable will or not was important. And really, he wasn't doing much other than encouraging her bad behavior.
Which, he supposed, was like work. Only enjoyable.
She was going all out and he didn't have to do a thing other than stand there looking regal and proud. She was the one who wanted to be Queen, after all. It was right that she did all the work. Or most of the work.
Because he couldn't stop himself from doing at least something. There was too much entertainment and pent up energy to be had to not at least kill one of the guards. Which he did, and took great delight in doing.