Because there is a whole lot more to the Creation story, Genesis 1-3, than the literal text.
Chapter 1 is the six states of man's regeneration and the rise of the Church of Adam. Chapter 2 describes the Church of Adam and the nature of Celestial people that comprised it. Chapter 3 describes further generations of that Church and it's eventual fall before the flood.
If you want to quibble that it's more important that a day is a day and ignore the meaning of the story, that's okay. That part of the Word (up to Genesis 11) was written in a quasi-historical style... like a myth.
"Chapter 1 is the six states of man's regeneration and the rise of the Church of Adam... "
Whoa friend! Where in the world are you getting all that from??? It is certainly not in the text! Seriously, what sort of theological viewpoint are you coming from.
"If you want to quibble that it's more important that a day is a day and ignore the meaning of the story, that's okay."
The importance of the story - it's meaning and significance - is intimately bound to the HISTORICAL nature of the material.
" That part of the Word (up to Genesis 11) was written in a quasi-historical style... like a myth."
On what do you base that opinion? Have you read it elswhere or do you read Hebrew?