Scientists can measure pain in someone so not a good example. Researchers at the University of Colorado at Boulder have found a unique neurologic signature in patients’ brain scans that allows them to predict how much pain a person is feeling with 90 to 100 percent accuracy.
That is evidence, concrete proof with repeatable observations producing tangible results. As I say people saying they see aliens, there has been a lot of them, doesn't constitute that aliens exists...the fact we have never seen or contacted or been approached by aliens is the "circumstantial evidence" that I keep repeating that leads to you the conclusion, beyond any reasonable doubt, that aliens do not exist or are not in our reach so may as well not exist.
Thus people saying they have seen god or talked to him etc and no matter how they number is not evidence like the ability to score pain and get over 90% accurate.
As I keep saying going by demonstrable evidence that can be repeated to produce tangible results the probability of god existing falls into the circumstantial evidence beyond any reasonable doubt he simply doesn't.
People having a religious experience lends zero weight to evidence a god exists when you factor in the religion itself, its history and the need for those who want an experience suddenly get one.
My sister passed away recently and two of her three children had unusual activity in the family home that they thought might have been their late mum. The third kid, a late teenager was pondering why he never had any such experience....two days later he did.
As Simon said the mind is powerful and those that want something have a tendency to see things that back up their wish or belief.
Rely on evidence and in the case of god where you can only rely on circumstantial the conclusion many come to is beyond reasonable doubt he doesn't exist.
I've still no answer as to why if he does does he not cut out the bull and just appear before us all, all 7.6 billion of us and communicate directly with us? Just think what he could do and at least reassure everyone we are not alone and he is creator.
Yet nothing, why? If he does exist he is a dick for leaving his creation to what we see around us....I refuse to believe there could be some sort of grander thinking behind NOT revealing himself to everyone.
You ask what evidence? Proper evidence but in this subject that is near impossible hence I'll stick to circumstantial evidence and beyond reasonable doubt and the "god doesn't exist" wins there.