Because I understand what science and the bible teach about creation. The problem is that my worldview can accommodate God and evolution whereas your worldview demands that you reject God. I can look critically at all evidence yet by default you must deny any evidence that could possibly suggest that God exists. The creation account in Genesis chapter 1 is written in a poetic style, it is espousing literal truth, but written in a less detailed, easily understandable, flowing prose. Contrast it with the book of Numbers (both written by Moses) and you'll see what I mean.