The most important reason anyone is an atheist

[pocaracas]

Here is the most important reason anyone (well most) is a atheist. Our default stance is to disbelief in something until it meet the burden of proof

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Now religion has a heavy burden because of the extraordinary claims made, and the reason we disbelief is because no evidence that is properly verifiable has been offered to to date.

Hold on there, cowboy. The fact that religion is widespread across time and cultures shows that it meets the evidential standard determined by convention or community. This definition goes against your position.

Either that, or...

That people are gullible across time and cultures... and there's always a conman taking advantage of that gullibility.