Certainly not a "Damascus road experience;" something like that would be as consistent - or more consistent - with mental illness as it would be with it being the product of an actual god.To your other response about the evidence, I agree a god is a pretty extraordinary claim. But what would suffice as evidence to that claim?
I think that if God actually existed the way he's described by, say, mainstream Christianity or Islam, the evidence for God would be a lot like the evidence for the moon:
- it's observable on a regular basis.
- we have intersubjective verification in our observations: any time I'm looking at the moon, I can ask you to look to and we'll agree "yes, that's the moon."
- it has frequent measurable, observable effects.
- those effects correlate with the behaviour of the moon and nothing else.
So that would be my starting point.