what do bah?'?s believe happens to a non-Bah?'? after death?

what happens to an atheist or a humanist or somebody of no beliefs?

Essentially, the same thing that would happen to a Baha'i after death. In their view, all religions teach basically the same thing and are equally valid; therefore, the afterlife is not segregated.

They get eaten by the munchkins then they come back to haunt all nonbelievers.....

the first answer is correct, you will not be punished in the afterlife for not being Baha'i