Pope Benedict’s speech from Regensburg (the one that let to all the riots from Muslims) is all about faith and reason (which makes some people’s reaction to it all the more ironic).
Here’s a link to it, it’s not very long and your friend would also see that Benedict’s speaking/writing style if very academic rather than emotional: zenit.org/article-16955?l=english
DISCLAIMER: Catholic Answers has turned over the archive to Catholic-Questions.org and no longer owns, manages, or moderates the forums. For additional apologetics resources please visit www.catholic.com.