That's a phrase attributed to Jon Foreman of Switchfoot in the book Body Piercing Saved My Life. I have never been a fan of using the word "christian" as an adjective, especially when applied to the arts. What is a "christian song" or "christian poem" or "christian story" anyway? I have never been satisfied with any of the supposed answers to questions of this sort -- like the principle that "christian radio" can play covers of U2 songs by "christian bands," but not the originals by U2. So Foreman says that they (Switchfoot) are a christian band by their faith, not by the genre of music they play. I like that, I like it a lot.
So am I a "christian professor?" Or a "christian novelist?" No, I don't think so.
I'm a Christian.