Atheists: What data would get you to consider believing in the existence of a deity?

For me: If it could be reproducibly demonstrated that prayer could change to outcome of events I’d seriously consider belief.
Update: Read "Effects of remote, retroactive intercessory prayer on outcomes in patients with bloodstream infection: Randomised control trial." L. Leibovici, 2001, BMJ, 323(7327):1450-1451.

I have. Other studies have shown prayer to be ineffective.
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