It has occurred to me that some people believe they are the authority of evidence for others, but it seems to me that authority lies with the individual. However I would agree that there are societal standards both formal an informal.
So my question is what are these standards? If I said my mother loves me would you consider that sufficient evidence to agree? Or do we need to run that hypothesis through the scientific method?
With that example, it depends on culture. My culture (American), parents want their children to fly when they get old to take care of themselves. They
love us by letting us flap our own wings. While in many Asian countries, the opposite is true. My friend told me once she is glad she lives with family (she's 34) because now she can take care of them like they took care of her.
So, her standards of whether my mother loved me was based on her cultural upbringing. My being in a diverse upbringing, my standards would be to let her live her standards rather than make her conform to mine.
If someone says god exist because they experienced him when they saved their daughter's life, and that's all they have, it depends on how you judge what is truth and what is not. I think the standard would not be universally set but
asked first to see what standards the other person has. Then help them based on their standards and not our own.
I talked with a therapist years ago and he was telling me about one client of his had hallucinations. He didn't give him medication for the hallucinations but because he was harming himself from the stress. When he "got used" to the hallucinations and was able to work and build his life up, he no longer needed therapeutic help.
Instead of the therapist invalidating his views and saying that his client is seeing things that wasn't there, the therapist (he told me) says he knows he sees something and he
treats the client as if that thing or event happened. Using that event or stresser to delve more into how it affected his client, and then find standards of what is "real" and what is not to where the client is comfortable with his hallucinations without thinking himself as crazy.
So, it really depends. If you're thinking of others, use their criteria. If you're thinking of yourself, what's your religious belief. If it's individual, it could be anything. If it's communal and cultural, standards would be agreed upon by the group.
If one person believes in god and another person does not, they are both in the same boat. If they needed a standard to know who is right and who is not, they'd have to find a common foundation and critieria to judge whether the standards are agreed on by both. Once agreed, then they can use that standard to test whether one person is right and the other person is not.
But the only universal standards is the laws of nature. Anything outside of that is our interpretation of ourselves, people around us, and our environment and place in the world.