A comet may have hit the Earth 13000 years ago but there is no mention in Genesis. You say if we study science and read Genesis that a day can equal a thousand years but that can't be right, it's clearly listed what was created on each day and according to science that order is incorrect.
One minute you're saying a day in Genesis is a very long period of time (billions of years), the next you're saying the dates 'work out perfect' as 7000 years of creation and 6000 years of genealogies to tie in with your comet theory, which is it?
Genesis clearly describes how Adam and Eve were formed and that they were the first humans, are you saying that those passages are to be taken literally and that it happened 6000 years ago? Again science does not agree.