For more than 500 years, this canonization process has followed a formal procedure in which one person (a postulator) presents the case in favor and another (the promoter of the faith) -- an
advocatus diaboli, or devil's advocate -- presents the case against.
The main act of "Fiat Homo" is the theatrical debate between the
Advocatus Diaboli and the Promoter Fidei--two ecclesiastical lawyers who must sift through the artifacts of Leibowitz uncovered by Brother Francis, and thus determines whether or not to canonize him as the martyr to science and the representative saint of pre-flame deluge civilization.
Candidates for sainthood were represented before the papal court by two spokesmen: the advocatus dei, who made the case for canonization, and the
advocatus diaboli, who advanced all conceivable arguments against canonizing the candidate.