Nice twist. If you THOUGHT you HAD a relationship with someone you NOW don't think exists (but DID THEN) you're not crazy. Especially in the case of a "someone" who can't be seen or heard etc. etc. etc.
Ask Angelo. He certainly doesn't define "Christian" as being someone with a relationship with a "Jesus" that he doesn't even think exists. You have to BE someone with some level of that relationship to believe that the relationship is the dividing line. I'm not willing to go that far. ;^)
Perhaps not. But I was here before he came unhinged and he certainly "talked the talk" like someone who had (or believed he had) such a relationship. More than one of the NCs here was "fooled" if he was faking it.
The real problem is that (if you fall into the OSAS crowd) you are forced to think that he was/is a liar. I don't need to make such an assumption.