Perhaps all you need is a change of perspective:

We all technically belong to God do we not? Even those of us who do not expouse a belief in a surpreme deity or a creator technically belong to God (since disbelief or lack thereof does nothing to diminish said dieties power really).

And we all technically belong in one way or another to a wide variety of both familial and social catagories of possession in addition to the overall all encompassing "belonging to God" etc. Such as John is a Mason, Paul is a Priest, Thomas is a Baptist, Roger is my brother, Lora is my friend etc.

So...Yes, I, you, my cat, the entire universe and everything in it; does belong to God, but we all also belong to others in a way as well, for instance: I also belong (catagorically or universally by definition) to my family, my country, my city, my proffession, my spouse (who in this case also happens to be my "owner"),etc.

I hope that analogy kind of helps you view your situation in a different light.