Given that the expansion speed of the universe can and has been measured, the time at which the universe was just a spec is absolutely known. This is why the time of the "Big Bang" is pretty certain. But it still has nothing to do with the fact your god supposedly wrote the Bible which just happens to leave out all events around the earth except for the eastern Mediterranean. Most easily explainable by the fact it was written instead by Bedouin men and many chapters were left out and there have been hundreds of translations of your vengeful god.