The way I see it, you have to consider Laveys use of "Satan" in the first place to promote his philosophies, Lavey didn't actually believe in a "satan" he used that imagery because the greater of society placed so much importance on it, "Satan" was a convenient tool. I would say to an extent the reason he used Hebrew is because many are not familiar with it, strange symbols, languages, and writings have always had a certain power to those that place importance on them, (not to speak of his use of Enochian in his rituals which was supposedly taught by angels that he did not believe in either) that is learned and those things are only as powerful as the power we give to them. A good example is that many "magical" alphabets or writings are in an unfamiliar language, the reason for this is that some believe if you are too familiar with a language or alphabet you lose some power of intent or purpose because you are so familiar with it, careful thought to each stroke of the pen or each fluctuation of the voice in strange languages for the purpose of "magic" seem to make it more powerful to some, I see this as just another way to visualize intent and something that should be gotten over because the self is where what is termed "magic" actually emanates from, the systems, symbols, languages etc. are secondary.
If you are interested in the basics, I think a good insight to Laveys thinking is "The Devil's Notebook", I bought it because I liked it and found it one of the funniest yet painfully truthful books printed in years, but don't spend hard earned money on something you would never read, go to a good book store, grab an espresso and read it for free in a comfortable chair, if you like it buy it, if not, put it back on the shelf you are not out anything but time.