Because it IS Biblical and since the God of the Bible is real and trustworthy, what He tells us is.
My acceptance of the creation account isn’t based on which one men say is the oldest, it’s based on the integrity of Scripture.
I see. So your belief in the creation story stems not from science or man, but simply from faith; you have no basis other than faith in your position on how the world was created.
And how does that separate your position from those who believe in evolution? Is their position not one of faith as well?