An excellent question and one I've thought about a lot.
I view the question as a form of "why do we owe our allegiance / love /worship / etc to God.
I can think of 4 basic reasons that could exist:
1) As creator he essential owns us, and we owe him for his act of creation.
2) He fundamentally more moral / noble than us, and by right of his speriority we should follow him.
3). He offers us some reward, sometimes in this life, usually in the next
4). If we don't he will break our kneecaps for all eternity.
I often wonder what religious people would do if they discovered that their god didn't meet some of those requirements.
In my personal opinion
1). We owe him but not without limit. We are thinking self-aware creations and should never be slaves. Stil the universe is really nice and I appreciate it.
2). If true, this would be a great reason.
3). That makes sense - but then worshiping god is not an act of goodness, but just of self-interest. It sort of puts religion in a rather disturbing light,
4). A lot of religions believe this, and there or lots of stories of the horrible things god does to punish people. So it makes sense to follow out of fear.
The problem is that I see no evidence for 2. Certainly the Abrahamic religions describe a God who commits all sorts of atrocities. (from the slaying of first-born of Egypt to Jobe's wife).
To me, those actions overweigh 1. 3 and 4 are then self interest, and I understand them, but I would not be proud to follow god for those reasons.
So I've chosen the other side, as that seems the more moral, if less self-serving one.
Let's say there is God. Not just a God but The GOD, only one, the "I AM."
Let's call Him the creator of heaven and earth who upholds ALL things by the word of His power.
If this "I AM" created all of humanity and everything that exists from nothing, does the creation have the right to question Him?
If so, why?