score:3
Heresy is distinguished as follows:
If one is invincibly ignorant that he holds a material heresy, he can possibly be saved; however, formal heretics cannot be saved, especially if their heresy is against the four truths absolutely necessary to believe for salvationβviz., that
Note: There is unanimous consent among Catholic theologians that truths #1 and #2 are absolutely necessary to be explicitly believed in order to be saved, but not all theologians (St. Thomas Aquinas, St. Alphonsus Liguori, et al. excepted) think that explicit belief in truths #3 and #4 is necessary; cf. True or False Pope p. 113 // PDF p. 128.
source