[Dimensio]

I have to wonder: does he believe there is any source of goodness or righteousness that exists, anywhere?

What is "goodness" and "righteousness"? I might agree that it exists, but I'd like a locked-down definition before I agree. For example, some people would define killing thousands who follow a different religion as "righteous", but I wouldn't accept such a thing as righteous, and I suspect that you wouldn't either.

Must be a pretty depressing life to be an atheist/agnostic.

Why do you think that?