The term "Satan" isn't really a name but a title which translates as "the opposer". The word predates christianity and occurs in other religions too.
Also, Satanists don't worship Satan from the bible.
Let me give you an example.
The Yazidi sect in parts of Iraq and Syria worship a being called Melek Taus.
The reason for the Yazidis' reputation of being devil worshipers is connected to the other name of Melek Taus, Shaytan, the same name the Koran has for Satan.
Hence, they are regarded as devil worshippers. However, in the Yazidi faith, Melek Taus was a chief angel sent by god to earth. He isn't regarded as "evil" because he was sent by god himself and he also rose in favor with god.
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Similarly, Satanists don't worship Satan from the Bible and most of them reject the entire creation story and other aspects of the Bible. There are different types of Satanists and some can be regarded as atheists. Some worship a being which they refer to as Satan (other names are also used) and others believe that Satan is just a force of nature and that they are their own God.
Because "Satan" is a title and not an actual name, it was used in the past to represent your enemies. "Satan" means "the opposer" and hence your enemies could be called "Satan". Anyone who opposes you could be given the title "Satan".
The original Hebrew term satan is a noun from a verb meaning primarily "to obstruct, oppose", as it is found in Numbers 22:22, 1 Samuel 29:4, Psalms 109:6.[6] Ha-Satan is traditionally translated as "the accuser" or "the adversary". The definite article ha- (English: "the") is used to show that this is a title bestowed on a being, versus the name of a being. Thus, this being would be referred to as "the satan".
Satanists regard Satan in a positive light and not as the "evil" being in the bible.
A little research can actually reveal a lot.
OT: You shouldn't concern yourself too much with the beliefs of others. Just live your life the way you want, believe whatever you want and leave other people alone. I really couldn't care if you worshipped your dog as long as you don't try to force your beliefs on me. Similarly, I never understand why people see the need to question the beliefs of other people (as strange as they may sometimes seem), especially when it has no impact on your life.
