Possibly a future area of research.
Carter, Joe, and John Coleman. How to Argue Like Jesus: Learning Persuasion from History’s Greatest Communicator. Crossway, 2009. [added 8-21-09]
Maddux, Kristy. “Finding Comedy in Theology: A Hopeful Supplement to Kenneth Burke’s Logology.” Philosophy & Rhetoric 39, no. 3 (2006): 208-232.
Yaghjian L.B. “Teaching Theological Reflection Well, Reflecting on Writing as a Theological Practice.” Teaching Theology and Religion, Volume 7, Number 2, April 2004 , pp. 83-94(12). Have pdf.
Yaghjian, Lucretia B. Writing Theology Well: A Rhetoric for Theological And Biblical Writers. Continuum 2006.