"God is not the name of God, but an opinion about Him." The quote is often attributed to Pope Sixtus I, but it is more likely to have been said by an anonymous Pythagorean philosopher.
What, if anything, does the quote mean to you? How do you interpret it?
I agree with the first part, "God is not the name of God". There are a lot of gods, and they're distinguished by their names. The Christian god is called Yahweh, for instance.
The second part, "but an opinion about Him" apparently means that, yes, there's an entity A, but no, A isn't a god / God unless in your opinion [he] is ─ in other words, the power of attributing godness to A rests with the individual.
The trouble is, there seem to be a lot of assumptions unexplained. Does entity A have to have particular qualities before you can legitimately deem [him] a god? Like being real, for example? Like having magic powers? Or can anyone, real or imaginary, play?
And what changes when you deem A to be a god / God? Just you, or does A's new status have a wider relevance? If you deem A a god / God, do you thereby take on specific obligations, or only those (if any) you feel like?
How would it actually work? Why would it matter?