I would not be welcome in a Church. I grew up essentially an atheist and do not believe nor ever have believed in the God prescribed by the Christian, Jewish or Muslim faiths. I am now closer to agnostic. As a queer kid from an extremely Christian town I have my own complicated relationship with Christianity as an outsider and my own history of inflicted traumas. Yet, I hold no issue with those who do not attempt to force their beliefs on me because those people who have harmed me do not represent everyone who has a religious belief. How people comport themselves towards others and their empathy and kindness towards their fellow humans matters to me more than what particularly they individually believe exists.
I recognize that for those people who hold beliefs that they do in fact believe them. They aren’t simply pretending to entertain you and that means that their dogmas have perceived consequences. Religious beliefs aren’t something people can change like their socks. It often lies very close to their personal conception of what it means to be human. To shake that belief they require a lot of evidence that makes a high degree of sense to them and disbelief often causes them to be at odds with their own families and communities.
It is enlightening to see that your definition of “religious nutcase” is someone who has any religious beliefs at all regardless whether they ever attempt to spread them or impact you in any way. I imagine you likely have experienced some sort of religious related trauma yourself but that does not make reacting to everyone with a belief system the way you are right now okay. You also seem to place people who experience mental illness or addiction as a category that makes it ok for you to dehumanize people. You place yourself as the only viable model of intelligence… Something which isn’t healthy. You may just be very young in which case you might grow out of these beliefs naturally over time but if not then you should really be seeking some therapy.
As for addictions and mental illnesses, people’s individual struggles are not my business either. Some people do struggle and it’s not my place to judge them on their quality of life, only the quality of their work.