Agreed, I like the idea of fan made pantheons for nationalistic ones, with maybe a few specific gods from, say the american pantheon, being either mantle of another god or abstract concepts and folk heroes that make up the whole thing. So basically, you could have a bunch of demigods roaming the overworld for the other pantheons.

Like America would have archetypes/the characters of Davy Crockett, Pecos Bill, Johnny Appleseed, Paul Bunyan, Justice, Liberty, Comlubia, Uncle Sam, and maybe a small section based around sleepy hollow(just cause i can see at least 3 folk hero characters...