Some might. There are many branches and leaves in both the evolutionist and creationist worldview trees. That axiom is simply a fairly significant trunk-branch.
That said, it is very rare that I hear someone describing themselves as Christian who denies the general 7 day creation story. I happen to personally believe it was seven consecutive days^, but I've heard arguments it could have been seven days with an unknown gap in-between each pair.
^ "day" being the most morally-understandable way of describing the intervals at which the creation occurred. Obviously there was no sun or even light at first, so the concept of a day itself is shaky, and I make no claims as to how many cesium-133 transitions may have occurred in that period, or how far light might have travelled in one of them once it was created, or the magnitude of the various fundamental forces' impact on matter in that period, or really anything related to our understanding of how the dynamics we currently observe may have behaved in those intervals.
Yep, and CS Lewis was religious as well- didn't stop me from enjoying the creation of narnia in the Magician's Nephew. It did stop me from enjoying the Last Battle, as that was too egregious.
