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Asteroid/comet striking the Earth that is large enough to cause global disaster: 1/1000

this stat alone proves that these are all made up

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According to NASA: "The asteroids capable of causing a global disaster if they hit the Earth are extremely rare. They probably would need to be about a kilometer or more in diameter. Such bodies impact the Earth only once every 100,000 years on average."

I assumed a human lives 100 years to make it simple.

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???

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if everyone lives 100 years, and a comet comes every 100,000 years, that would be 1 comet for each 100,000/100 = 1,000 generations

since we can assume the comet will kill everyone, your chance of dying from one is 1/1,000