Can I choose not to serve either?
Actually, I believe in god, as mankind can not find any other explanation for reality rather than some divine being. I mean, physicians can explain me all they want how big bang created the universe, but they cant tell me why there was one in the first place.So there has to be some kind of "god".
Do I believe that this is the christian, muslim or whatever god some religion claims to be "the god"? Hell no. I can get along pretty well without having some religion tell me how to live. That is what religions are to me in their core. They take belief in a divine being and add rules how that being should be worshipped and how you should live.
So while I stated that I did not believe in the god proclaimed to be god by any religion, I do not worship satan. At least I hope so, unless you can worship without actually trying to.