May or may not be relevant. Statistically, people with illnesses like schizophrenia are no more likely to commit violent crimes than the general population (but are more likely to be victims of violent crimes). There are documented cases of people with schizophrenia killing or commiting other violent acts in response to delusions, but it’s usually in an act that they perceive as self-defense rather than being driven by malice or desire to harm. I.e., it’s generally more like “I killed my dad because he was going to kill me” rather than “I went out and murdered some random women because no women like me.”
In my hyper religious, Southern Baptist upbringing, I often heard Christians say that Christianity is not a religion. The mental gymnastics employed to explain this position were varied. Most often it was “Christianity isn’t a religion, it’s a relationship [with God]”, or something along the lines of “Christianity isn’t a religion because it’s true”.
“Religion” in general was thus deemed a bad thing, because it was a term used to encapsulate all the other (and thus false) faith-belief-philosophy systems that were used by Satan to lead the world away from God. It bears noting that Catholicism and other major denominations always all fell under that umbrella of “other”.