Earlier quoted context omitted.
What if a person sincerely believes Jesus was gay, and that Muhamad was a pedophile? Were do you draw the line at sincerely held religious beliefs and what you think is not a sincere religious belief?
Why do you care so much about what other people believe? It's like you are trying to justify religious persecution.
As a side note that many readers might find interesting, delusion as defined in the DSM-5, the book that defines what is and isn't a "mental illness", EXPLICTLY makes an exception for "religious beliefs" when it comes to delusions. I.E., if you believe in Zeus and Thor and claim you pray and worship them, you can can be admitted for delusion because those "religions" aren't considered socio-normal, I.E. no big groups of people actively practice them. It's kind of the idea why cults are considered delusions. Now, you take that same exact logic, but apply it to someone who claims they talk to Jesus or Allah, bam, exemption and it's perfectly normal delusions.