How do they know that

Another twinkling star in the sky perhaps?

Father Damien en route to be a saint

It's on the news here 'cause he was a Belgian, and I'm not saying that he didn't do good, even if his wiki page has a positive bias the man still did good.
However the good he did while alive was real and deserves respect and remembrance but why do some humans feel the need to supplement that with imaginary good and a fantasy of continued life?

What also strikes me as odd is that the "miracle cures" are the usual (easy?) cancer and a seemingly banal tummy ache.
You'd think a man who devoted his life to the sufferers of Hansen's disease (leprosy) and having contracted and died of the same disease would at least cure somebody afflicted with that, but I guess in the afterlife he must have gained some knowledge that it's not a problem anymore or perhaps there's a learning curve and everyone has to start with the easy stuff before they can move up to more difficult diseases, who knows, a tummy ache in 1895, a cancer in 2000, such a step in 100 years suggests that in about 100 years he may be able to grow someone's limb back.