OK, I'll bite. Mind you, I'm anything but an atheist. Still, I must posit a few points/questions---
- Let there be light: A comprehensive review of known, provable physics tells us that for the first 300,000 years after the Big Bang, the universe was too hot and dense and thus was opaque to light, so if God offered Let there be Light, that had to have been 300,000 years after the universe was born.
- I'm at a loss to believe that God's night and day were anything like our own, seeing that when God was creating the universe for there to be "nights" in between the "days," those earthly days and nights for which the Bible refers did not yet exist for another 9.2 billion years after the universe became transparent to light energy.
Meaningless. The Earth could not have been created before the universe was transparent to light as not only was ordinary matter impossible back then, but all our stratigraphic evidence shows the Earth not nearly old enough. But if it only means that the ball of rock that would become the Earth first began forming and accreting before solar light burst forth onto the scene due either to nuclear ignition or there simply being enough dust and gas cleared away for it to get through, I say: So what?
Well sure, that is the only thing that makes sense. Why would a day in God's life equal the same time period as a day on Earth, one planet among trillions which did not even come into being for billions of years after the creation of the universe? Being that Genesis was written an estimated 1600 years BC, the early farmers, etc., of that time then trying to encapsulated the origin of the world expressed it as best as they could imagine and that others might relate to back then.
They have measured ice samples deep with glaciers, etc., whose ice is a lot more than 13,000 years old, and they KNOW by means of various tests for known physical processes like atomic decay, various isotopes, etc., for things like carbon and trapped air bubbles in the ice.
NO DOUBT ABOUT IT: The earth was around about 4,599,987,000 years before your 13Kyrs ever got off the ground.
The greatest failing of Christianity is the constant effort to reconcile various statements and suggestions in the Bible with present day understanding of the physics of the universe by trying to invent some pseudoscience uniting the two.
HINT: There is no reconciling everything stated in the Bible with present scientific understanding! But that neither disproves God nor disproves theism. It only proves that not everything written in the Bible can be taken literally.