Are they? And anyway, plenty of trees have been observed falling in the forest, and gravity in general. Not so many repeatable observations about divine beings, healing, etc.

Absence of evidence isn't proof of existence. Ultimately it's all about probabilities based what is known. Unlikely there is a blue teacup within Saturn's rings or a flying spaghetti monster.

I'd say there's a lot less evidence of god than a tree falling in the forest that nobody was there to see.