This is in direct contrast to the thread "What would it take to make you a Christian". It's an honest question, not a troll. I am actually quite curious to see the response to this, as I am a Christian myself.
Also, this question is primarily directed at Christians, but any other theists are welcome to answer.
[spoiler]As for what would make me an atheist, it would have to be overwhelming proof to the contrary of a deity.[/spoiler]
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For Jesus himself to come down for Heaven and tell me He isn't real.