Well, sort of. I mean, as close as you can at a public university.
I was teaching about target marketing, and I used as an example the first Narnia movie from the Christmas season, a year ago. I talked about the general ads that were on TV for the movie, presenting it as a fun, adventure fantasy movie with great special effects and exciting battles. Then I explained that C.S. Lewis was a Christian who wrote the Chronicles of Narnia to explore various religious themes, and therefore churches and Christian bookstores were also heavy promoters of the film.
With a picture of Aslan on the screen behind me, I talked about how Edmund's poor choices led him to be condemned to die at the White Witch's hands, but that Aslan stepped in as a substitute and died in his place, so Edmund could go free. Then Aslan rose from the dead, and led the armies of Good in warfare to defeat the White Witch once and for all.
I said, "You don't have to have spent a lot of time in Sunday School to know what that story is really about."
I can drop biblical references and Chirstian principles in lectures every now and then, but this was the first time I actually explained an allegory for the Good News.