The creation account found in Genesis 1 follows the same order science states as fact. The use of "day" in Genesis does not necessarily mean the 24 hour day we use. The Hebrew word translated "day" can also mean "brought to pass" and can allude to eons of time. The significance of Genesis is "In the beginning God created."
Molecular genetics can show that every human being on this planet is descended from one woman the Bible calls her Eve. Molecular genetics can also show that all mankind is descended from one man and the Bible calls him Adam.
The Bible was not given to us as a book of science it was given to us to teach mankind the nature, character, and purposes of God. Science can take us back to one point in time and space but they cannot explain where matter and energy came from. It does not matter if the universe is 15,000 or 15 billion years old what matters is that "In the beginning God created".