The Collaborative International Dictionary of English v.0.48:

Credendum \Cre*den"dum\ (kr?-d?n"d?m), n.; pl. Credenda (-d?).
   [L., fr. credere to believe.] (Theol.)
   A thing to be believed; an article of faith; -- distinguished
   from agendum, a practical duty.
   [1913 Webster]

         The great articles and credenda of Christianity.
                                                  --South.
   [1913 Webster]

WordNet (r) 3.0 (2006):

credendum
    n 1: (Christianity) any of the sections into which a creed or
         other statement of doctrine is divided [syn: article of
         faith, credendum]