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> we can estimate how long ago the last common ancestors lived.

That is an estimate. That is not concrete evidence. Since humans don't live long enough to observe major evolution then it takes just as much faith to believe in evolution as to believe in other theories.

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Extrapolating based on known evidence and having a fossil record to confirm that extrapolation is not faith, it's evidence based logical reasoning. I didn't see the sun rise on the 3rd of June 1924, but it's not faith to believe that it did so.

> it's not faith to believe that it did so.

Doesn't believing require faith? Extrapolating requires belief that the correct conclusion is being reached.

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