Several years ago I had some work to do at a hospital which included being on two wards for the mentally ill. We were not to engage with the patients but get on with the job assignment.
I observed several people who genuinely believed that God or a higher authority was talking directly to them. Several of them were genuinely polite people, who except for their medical diagnosis of either psychosis or schizophrenia or both, looked and spoke like a 'normal' person.
It was later on the thought occurred to me that if you are part of a religion and believe you are God's channel and He speaks directly to you nobody bats an eyelid. Whereas if you are in the wider community and go around telling others the same thing you will likely end up being treated in a hospital ward for the insane for a very long time!