Tell me, please, which is the more extraordinary claim here:
1. There is a man who lives in my attic. You cannot see him. You cannot hear him. You cannot feel him. He leaves no tracks in the dust. There is absolutely no tangible, verifiable evidence that he exists. But I know he's there because he talks to me in my mind. He doesn't talk to anyone else, just me. Therefore, he is real.
OR
2. The narrator of #1 is probably insane and there is probably no man in his attic.
Can you honestly equate these two statements as being equal in insanity? Can you honestly believe that the person who makes statement #1 should be treated as though everything he says is the truth? And what if he tells you that some person (or people) must be killed because the voice tells him they are evil, and the voice knows everything and is good, because the voice tells him so.
I think the man making statement #1 would have to provide proof before he could be released from the asylum. But if he says that the voice speaking to him is God, people send him money instead.