I'm starting to warm up to this show a little bit. Even I have an idea for a Satan worshipping game in Antarctica.
ok *clears throat*
Your a Satan occultist, that's part of a larger cult secretly stationed in Antarctica, since they believe that is the spot where Satan fell when he descended from Heaven. Your tasked with various missions to infiltrate society and find new recruits and recover artifacts necessary for a ceremony that will bring Satan to the mortal realm. Along the way you meet a ton of interesting characters, and learn the fundamental tenants of Satanism.
You can upgrade your character with blood sacrifices and do evil deeds to gain favor with the dark one. All the while you're trying to be stopped by various religious groups with the final mission being to defend the base from Christians while the ceremony takes place. At then end, Satan rises from below the ice, smites all of his enemies, turns all of his followers into demons and makes you his right hand man, and enslaves the human race for an eternity of torture and suffering.