ACtually I would argue that its precisely because is not obligated to serve anyone (and that everyone - either directly or indirectly - is constantly, constitutionally and irrevocably in a relationship of service with him) that he is important.
IOW its the unique position of god that distinguishes him from others that are merely powerful, influential, etc (but as the most powerful, most influential etc) that make him important
At the same time, God being in the position of the most important, and if we assume that God cannot act against Himself nor cause any lasting damage to anyone, then God is also the one that can be most easily and most safely ignored.
God is bound to His subjects, a servant to them even as He lords over them, whether they acknowledge Him or not.
Other than God, there is no other being in a position of power that one could ignore and still be left alive and even unharmed. Everyone else in a position of power makes it clear that they will not tolerate being ignored.