Heheheh... No, he does not believe in any sort of supernatural beings. He believes in himself and his own ability to make his way in life. This is the real Satanist doctrine. As I said in an earlier post, they are VERY conservative. Self-reliance is the biggest thing about Satanism.
You (like most people) seem to think that Satanism is a religion. It is not. It is an ANTI-religion. They HATE all religion. Religion to them is a lot of superstitious bunk and is to be ridiculed at every opportunity. As I said earlier, they do and say a lot of the things they do just to tick off and ridicule Christians. All the "Satan worshipping" stuff is just a front. I saw a news show one time where they did one of their fake rituals for the camera, then had a good laugh about it afterward.
No, he doesn't believe in any kind of supernatural anything. No godlike beings, no devils, no angels, no magic/magick/majik/whatever... All of that is just funny to them.
Go read some Alastair Crowley stuff. He is (was) their true founder, and explains everything very clearly in plain English as to what Satanism really is.
Actually, there are different kinds of Satanists. The ones you refer to are the religious Satanists, who are really more occult humanists than anything else. They basically see Satan as just a symbol for all that is verboten, and all that is desireable. ANOTHER kind of Satanist is the Palladinst. Palladinists see Satan and God as actual beings, and belive that the former will eventually overthrow the latter.