Myers-Briggs personality typing is widely used in the Christian church as an aid to individual self-understanding and spiritual formation. However, some Christian leaders have expressed doubt about its validity in understanding human personality and also opposition to its use in nurturing spiritual growth. The aim of the work reported was to identify and examine the reasons for this negative stance towards personality typing. It was achieved by content analysis of published writings and, in a few cases, by correspondence with persons known to have a critical stance. The analysis showed five principal areas of concern: misuse of personality typing in spiritual formation; personality typing as a simplistic analysis; personality typing as a restrictive pigeon-holing; unethical use of personality typing; and the Jungian derivation of personality type theory. Evaluation of this unease reveals significant semantic and epistemological issues and also a concern that personality typing, while not denying the tenets of Christian belief, could rival them for primacy in the hearts and minds of Christians.