Why would a solar physicist embrace the non-rationality of religion?

It turns out that the guy who has done a very thorough job of rebutting climate-change denialist claims, is an active Christian and a good scientist. This seems to worry the author of the article:

How can a rational mind like Cook's – a solar physicist by training – also embrace the non-rationality of religion, if indeed he even accepts the premise? Predictably, he uses evolution as an example. "I hold much store in empirical evidence ... There are multiple lines of evidence that humans evolved from lower life-forms. However, there are questions where a little more humility is required."

http://www.guardian.co.uk/environment/blog/2010/aug/25/solar-physicist-religion