The Bible is not the original source of the 7 day creation story.. just like the story of Noah comes from the Sumerians... the 7 days of creation story comes from the Mayans and probably even earlier civilisations
Mayan Majix - Learning Lab
The problem is with people who believe the bible to be the word of God is that the word of God is Plagiarism of knowledge unbeknown to a people of around 1400 ya.
Now that the knowledge is known the world should move on and find the God that they pray for and not the God they invented.
Carl Sagan - A thousand years of darkness
http://www.youtube.com/watch?v=Eh0eM4tAISQ