Haha, this was great. I arrived at an article about “John Frum” which did sound like a secret, and was quite the rabbit hole [1].
It got me worried about history. The whole story sounds like 90s zine fiction, which I think it is - there is no record I could find beyond the original story from 1995 on Harper’s Magazine [2], yet it is now in Wikipedia, stated as a fact.
[1] https://en.wikipedia.org/wiki/John_Frum
[2] https://skeptichume.weebly.com/the-gospel-according-to-prum....