The Collaborative International Dictionary of English v.0.48:

Theologue \The"o*logue\, n. [Cf. L. theologus, Gr. ?, and E.
   philologue.]
   1. A theologian. --Dryden.
      [1913 Webster]

            Ye gentle theologues of calmer kind.  --Young.
      [1913 Webster]

            He [Jerome] was the theologue -- and the word is
            designation enough.                   --I. Taylor.
      [1913 Webster]

   2. A student in a theological seminary. [Written also
      theolog.] [Colloq. U. S.]
      [1913 Webster]