I know I have heard it time and again and I agree, personal experiences are not proof of god to anyone else. I know that and agree. My question is, why do Atheists think personal experiences are invalid proof to the one who experiences them? Just because personal experience doesn't constitute proof for everyone it should be rejected altogether?
Have you ever hallucinated? I know I have.
Have you ever thought you saw something but been mistaken? I know I've done that, too.
I was listening to a P.Z. Myers lecture the other day where he put it a way I really liked: human beings have
bad brains. They're fantastic and wonderful in a lot of ways, but they're really not ideal for a lot of the things we try to do with them. They can be tricked.
If we want to be sure of what's going on, then we try our best to take the problems of our brains out of the equation. This is something that science does very well - though the principle extends beyond just formal science.
Also, there's something that I've found a lot of people who have had personal experiences of "God" gloss over: inferring God is actually a two-stage process.
1. I experienced some set of stimuli/perceptions/sensations/etc.
2. The source of that set of stimuli/perceptions/sensations/etc. is God (or my supernatural entity of choice).
Part 1 falls on the person doing the experiencing. I have no way to peer inside your brain to see what you see, so it's hard for me to argue that you didn't see what you claim to have seen.
However, part 2 can be done by anyone. Given some set of stimuli/perceptions/etc. assumed from part 1,
anyone can consider the logic and reasoning that starts from those perceptions and concludes God. That part is
not dependent on personal experience.
Personal experiences are only "proof" in the tautological sense: I agree that you experienced what you experienced, whatever it is. But you don't experience "God", you experience some set of perceptions
that you attribute to God. The person doing the experience doesn't have some special advantage in making a proper attribution of the experience. In fact, IMO, sometimes, they're actually at a
disadvantage compared to a neutral outside party.