God's Word and Man's Word. What is your world view? How do you filter things in your day?
Do you stand on the infallible inerrant Word of God or on the fallibile cleverness of man's word?
The Creation account is where man's ideas have attacked the foundations of our faith. A literal understanding of Creation, as occuring in six 24 hour days, is important in our faith in God's Word and our preaching of the Gospel.