If trustworthy testimony is a valid form of evidence in a law court, could it be a valid form of evidence in a religious claim?
Depends. If a group of people said that someone shot up a mall, but there was no physical evidence like bullet casings on the floor or bullet holes, and there were no reported deaths or other reports of a mall shooting, the testimony becomes suspect; even if those giving the testimony are trustworthy. Testimony requires verifiable evidence to be considered valid.
I think that religious claims require even more thorough testing, though, like testing done on a scientific level. Extraordinary claims require extraordinary evidence.
Hmmm... Maybe mundane, but unverifiable beliefs are easier to believe because because they do mirror verifiable things. As people say, they are "educated guesses." Those can be wrong, and if they are, we just adapt- but those beliefs don't necessarily impact day to day life.
Most mundane things we deal with in daily life are already well known. When we guess about other mundane things outside of what we already deal with, it doesn't really impact our lives directly. Those beliefs generally seem pretty harmless.
Many supernatural beliefs are often said to be able to influence daily life, however. Things such as prayer, demonic influence, and gifts of the holy spirit are examples I can think of off the top of my head. Some of those beliefs can be pretty harmful, like if someone tries to cast demons out of the child when they have a mental illness instead of just taking them to see a psychologist.
Then again, mundane unverifiable beliefs can also be harmful too, now that I think about it. Alien abductions come to mind (even though those can be explained via sleep paralysis), as well as many other conspiracies. Those are beliefs that can usurp more readily seen mundane beliefs in workings that we already know and deal with every day.
Postulating that aliens could exist is one thing, but saying that they abduct people is another. Postulating that gods exist is one thing, but saying you can cast demons out of people is another.
Sorry if some of this isn't making sense... I literally just woke up and I am in dire need of some coffee. I'm just letting my mind run on a tangent and freewheel to help kickstart my brain.