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hmm, it seems that the probability of existence is always either 0% (doesnt exist) or 100% (does exist). There isnt really any third choice such as 80% (something existing 8 times out of ten). Based on this then Id say that the probability of Gods existence is always the same; either 0% or 100 %

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"Probability" means the likelihood of something occurring based on incomplete information.

For example, taking your stance it's either 100% or 0 that your flush will hit on the river. But because we don't know everything, we assign probabilities. The question being asked is whether or not certain information would change an individual's beliefs about the likelihood of God.

The answer is there isn't a sane person who wouldn't change their probability assessment based on strong evidence. For me such evidence would be a verifiable miracle, such as a whole ward of a hospital getting cured overnight, God appearing and talking to 100,000 people at once, a hurricane (such as Rita) disappearing in a minute, a faith healer curing a visible external injury instantly, someone brought back from several days dead, all the bibles in the world suddenly becoming clear and unambiguous There are a million things that would make me a believer, not one has been proven to happen.