No, absolutely not! But they do feel pressure to get grants, accredidations, rankings, etc. While it is definitely evil to put such things ahead of remaining a Christian university, and certainly even more evil to market oneself as a Christian university while allowing oneself to be so perverted; I was just recognizing that such pressures create a pressure bible colleges do not face.
Grant-writers and accrediting boards frown greatly on what they call censorship; even moreso on "discriminating" against heretical professors. If you then hire secular professors to teach secular subjects, you still find yourself with scads of secularists running around, implementing policies and protesting assertions of authenticity. If you resist hiring secula professors, good luck getting accredidation.
(Since this old thread has been revived today, I happened upon your post again.)
Coincidentally, the bible college I mentioned -- Emmaus Bible College -- is in the process of attaining the full accreditation of the North Central Association of Colleges and Schools as we speak. I'm confident EBC will never hire a secular professor.