It certainly wouldn't be good enough for me to have some sort of 'personal experience of God' - if I started receiving what one could call 'messages from God', or anything like that, then I'd just assume that I'm hallucinating and need to seek psychiatric help.
The scientific view of the world has undergone many revolutions in the past. None of those would have encouraged me to believe in God had I lived when they occured, and I'm not sure why I should expect future revolutions to do so.
Lots of people returning from the dead, the end of all suffering, etc, could be evidence of interference from some higher intelligence.
Events in the future may convince me to believe in God according to certain definitions of the term, but I doubt I could ever believe in the God of the major monotheisms. I think such a God is impossible: a contradiction given the conditions of life. I know there are many people who have attempted the contradiction(s), but I don't consider any of them to have been successful.
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"There is no idea, however ancient and absurd, that is not capable of improving our knowledge."