You've got to be joking. Are you operating under Poe's Law? By your (il)logic, we can't even tell approximately how long the murdered have been dead by checking rigor mortis. As it should be obvious, events in the past leave evidence in the present. Forgotten dating techniques?
I'm not denying that we can make presuppositions. I'm questioning their rational basis under the two respective worldviews of atheism and Christianity. I am not dealing with other worldviews right now - only those two.
(Yes there are so-called "theistic evolutionists." My reason for selecting atheism is because I thinkg that Darwism fits most consistently into that particular worldview, as Darwinism attempts to provide a rational basis for it, e.g. a way to explain our origins without God).