Many people bring forth the argument that the chances of life, especially

Many people bring forth the argument that the chances of life, especially intelligent human life, occurring are so ridiculously improbable that the only way to explain it is to bring a creator into the picture. I've heard various figures thrown around and grains of sand in the universe brought in to explain how unlikely it is. But is the actual science behind the probability sound? And do you think that this is a good reason to believe in a creator? And what about a rational, logical argument explaining how this is not a very good reason? Thanks.

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