First off, we are all agnostics if we are honest. To claim absolute knowledge about a supernatural one must be either delusional or lying. This goes for both theists and atheists.
Yup. This is why I say we are all agnostic.
When an atheist claims to know for certain there are no gods, he/she opens her/himself to all manner of go nowhere discussions ending with the atheist having egg on her/his face.
Some Xians are now saying god is love. What do you think of that definition?
A corollary to this issue is the open ended nature of attempting to disprove all possible gods. This is where the real problem comes from. It is conceivably possible to come up with refutations of all gods ever thought of. But the open ended problem of declaring refutation of all gods is that you must account for all future claims of gods as well. And this throws open the door to the unknown. Simply put we cannot offer a refutation of a claim we have not heard.
The word disprove means to remove proof.
We cannot honestly refute what has not yet been claimed.
How can you prove or disprove anything that is unobservable?
So what I am saying (and I certainly don't believe in such a being) is IF our observable Universe was created by such a being who exists outside of it's creation, that being is inherently unknowable by current technology and MAY be unknowable until the heat death of our Universe.
Such a definition of Universe seems flawed. Why does it contain "all we can observe"? Is this true, by your definition, even in principle? It is not necessarily true that the known universe is all we can observe, nor that all we can observe is the known universe.
How would the heat death of our universe enable us to know something of this hypothetical creator?
The multi-verse proposition is not something I've been proposing. I do not find it plausible. Interesting, yes; plausible, no. Not yet - there is no evidence.
To speculate about what we cannot observe is metaphysics.
Please give me an exmaple of something we can observe that is not contained in our observable Universe.
If you are interested in this sort of thing try reading Lee Smolin's work from the early 90's about black hole singularities being the creation point for other universes. Or read Brian Greene's 2 books - 'The Elegant Universe' and 'The Fabric of the Cosmos'. Even basic quantum mechanics can imply a multi-verse - if you accept the 'many worlds' instead of the Copenhagen interpretation.