In Peter Berger's terms, the sacred and the profane are like oil and water. In Augustine's terms, the heavenly and earthly kingdoms are two distinct realms, a Christian being only a pilgrim passing through the latter, hence not to be "of it" while in it. I contend that such "white and black" dichotomies are artificial, and thus ill-fitting as paradigms in which to situate religion and ethical business leadership. Perhaps a devoutly religious CEO can unabashedly apply ethical elements of his or her religion without severing them from their theological underpinnings, and therefore without the need for subterfuge. I suspect that the legions of the CEO's subordinates would feel more, rather than less, respected.
The full essay is at “Religion in Ethical Leadership in the Secular Context of Business”