[jwalsh07]

Personally, I don't claim to have a working hypothesis for the origin of the universe.

Then, necessarily, you must leave open the possibility of a Supreme Being as one possible explanantion yet atheists by definition deny this possibility.

And by doing so, they no longer can claim the mantle of scientific inquiry because they have ruled out what is indeed a distinct possible outcome when all is said and done.

To be clear, I'm a Grandpa and will be long gone by the time science tunes evolutionary theory and the cosmology of creation. So, I'm interested in the big picture which to me is Creation.

[Dimensio]

Then, necessarily, you must leave open the possibility of a Supreme Being as one possible explanantion yet atheists by definition deny this possibility.

Deny? I don't deny, I simply refuse to accept without evidence. Show me evidence of a universe-creating "Supreme Being", and I might change my tune.

And by doing so, they no longer can claim the mantle of scientific inquiry because they have ruled out what is indeed a distinct possible outcome when all is said and done.

That depends. When you say "supreme being" are you referring to a purely natural phenomenon, or are you implying supernatural qualities as well?