> American Exceptionalism even has a creation myth and a pantheon of gods. It's something else entirely.

Are you referring to the American Revolution and the Founding Fathers? If so that sort of thing doesn't seem exclusive to American Exceptionalism...

"There's a difference between a claim that a country is unique for some reason (everyone has one of these) versus thinking that this makes them superior or entitled."

Rationally, yes.

Psychologically, no.

The latter counts for more.

Please explain the creation myth and pantheon of Gods?

By your own definition, last century saw overt nationalistic exceptionalism in at least Japan and Germany, also with an associated creation myth and pantheon of gods. Depending on how thin you want to spread it, I think there's a good case for throwing in Italy and Turkey/Ottomans and probably all the European colonial powers.