Because they pay attention and realize the complexity that exists on this planet didn't happen unguided, that life cannot arise from non-life, that there is literally no way to even force that to happen no matter how hard we try, and that even if life COULD arise from non-life, the math doesn't add up, because the complexity we see here even on the cellular level would take more years than there are atoms in the universe for us to be here unguided, which is a number so enormous that it makes the 14.7 billion years we believe the universe has been around look very, very small.
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