I encountered this interesting (but seriously flawed) definition of evidence:
"Of course they have evidence! People don't hold beliefs in a vacuum. The mind can only believe something if it actually believes it. And it can only believe it if it has been persuaded that it is true. Whatever the things were which caused that persuasion, that is what we call evidence. My evidence is different from theirs only in the sense that I find my evidence compelling, and I do not find theirs compelling. I admit that they have evidence, but I think they interpret it incorrectly (or that there isn't enough evidence to warrant the strength of their belief)."
Note in particular: "Whatever the things were which caused that persuasion, that is what we call evidence."
Apparently pretty much anything is "evidence". How do you define evidence?