Will a sign from God will convince us of his existence?

[Ben Davis]

I agree with Tor. One incident (or 'personal experience', if you like) is not enough data to form coherent hypotheses let alone workable experiments or viable theory. The evidence would have to repeated, repeatable and reproducible then experimentally examined before any practical judgement could be made.

The reason I'd be so rigorous is that we're not talking about a common-or-garden situation here, we're talking about one of the most important social issues in existence.