Satanism is based on doubt not belief.
Most people believe in supernatural entities such as God and Santa Claus. (I rather lean toward Santa myself, but that's another story
However Satanism asks you to dispense with all that and strive to be street smart. What if there were no
supernatural beings at all?
The advantages in taking this perspective are many, not the least of which is the advantage of not being duped by the many religions that would happily accept your donations and services for life.
I am not going to split hairs here on the issue of "supernatural" versus "preternatural". I think I understand the sense in which you are asking this question.
The biggest Big Ju Ju of all is usually God and Satanism asks you to consider yourself as God, which also has a number of advantages. (You can awaken in the morning, look bleary-eyed in to the mirror and mutter, "Oh God!" and be right!
This issue is a little like asking a Victorian lady if she has orgasms when she has sex. In a sense we don't talk about such things in public.
In the same way, in ritual the Satanist shelves his disbeliefs
and indulges in directly interacting with any and all supernatural beings he so desires.
The trick is, in both places, both inside and outside the ritual chamber, to not
con yourself with regard to why you are doing what you are doing. Beliefs can sometimes make good servants but are always poor masters.
Doubt can enable you to test and discover truth.
Belief, however, can lock you into the cellar of delusion.
It is not so much a matter of doctrine, in my opinion, as it is a matter of using these ideas to produce desired results.
Just use your head and remember why you are doing whatever you are doing.
That's how I see it.