It is argued that the Roman Catholic (RC) and Eastern Orthodox Church (EO) ought to be preferred over the Protestant (P) position because these churches provide the individual believer with more certainty and clarity concerning claims of Faith and Practice. These institutions, it is argued, can infallibly and authoritatively elaborate and explain doctrine in a way that gives more epistemological certainty and clarity about theological propositions. Thus, from this the RC and EO argue that there positions are more reasonable to believe because they can provide one with more theological certainty than P.
This is how the argument might run:
P1: If r provides more theological certainty than p then r is more reasonable to believe than p
P2: RC and EO provide more theological certainty than P
C: Hence, RC and EO are more reasonable to believe than P
It seems to me that P1 is clearly false. We can think of a counter example to P1 that renders it entirely unreasonable to believe. Let us suppose there was a Christian position where God implanted in our minds *all* infallible and authoritative revelation that could not be doubted in the same way that 1+1=2 cannot be doubted. According to this rationalistic position all theological propositions that are essential for faith and practice were revealed to us in this infallible a priori fashion. Now surely this way of God revealing himself would be far clearer than using our fallible senses that can be possibly mistaken to read or hear infallible propositions. But surely no one believes this position or thinks that because it offers more epistemological clarity and certainty that it ought to be preferred over P, EO, and RC.
Another Problem is that I can find no good reason for even affirming P1, so even if the previous argument were to fail it still seems we have no positive reason for affirming P1. Thus, at best we ought to be agnostic with respect to P1.
Therefore, it seems that this argument is unsound and ought to be rejected when it is used for positive support for RC and EO against P. If one were to accept RC and EO they would have to offer independent reasons for doing so rather than pointing out that if one where to accept it they would have more epistemological certainty concerning doctrine.