"I doubt whether the author understands that Christians believe in reason too," He is talking about fundamentalist, which reason is a concept that is foreign to them.I think the basic misunderstanding arises from the what "fundamentalist" means to each party.
The author of this piece thinks fundamentalist means this: 
Most Christians think it means this: 
or this: 
BTW that second guy is:
Dr. "Fritz" Schaefer is the Graham Perdue Professor of Chemistry and the director of the Center for Computational Quantum Chemistry at the University of Georgia. He has been nominated for the Nobel Prize and was recently named the third-most cited chemist in the world.
" think the basic misunderstanding arises from the what "fundamentalist" means to each party."
I draw a lot of my conception of fundamentalism from what I read on this site, that and being subjected to it in my youth for many years.
And what I draw from here is deeply concerning. It demonstrates many parallels between Islam and itself.