Continental drift, tectonic uplift and subsidance have all been measured directly. We have techniques accurate enough to actually measure the movement of the earth's crust. We know that erosion happens and that climates can change. Populations of organisms can mutate, change and even speciate over generations. It has all been observed - directly . So, what makes more sense. To apply what we know happness to organisms and the earth to come up with a picute of how old the planet is and how it (and it's biosphere) have changed, OR to take crytpic referenced from an ancient text (like "fountains of the deep"), , and try to paint the same picture. It is like saying "well, it could of happened like this - inspite of all the evidence that says it didnt". One method used observed properties of nature to come up with an answer, the other dismisses them to come up with the answer. Imagine a homocide investigation that ignores the murder weapon, fingerprints, DNA evidence and eyewitnesses just so that it can make a case against an imaginary "demon".