a) Disagreement as to whether salvation is an event or a process?
b) Disagreement about the doctrine of the Immaculate Conception?
c) Disagreement about praying for the dead?
d) Disagreement about the existence of purgatory?
e) Disagreement about how to understand baptism?
f) Disagreement about the doctrine of Transubstantiation?
g) Disagreement about confession of one’s sins being heard by a priest?
h) Disagreement about the perpetual virginity of the Mother of God?
i) Disagreement about the papacy and papal infallibility?
j) Some other doctrine or factor?
I believe the problem is I. In particular, Infallibility.
in·fal·li·ble (ĭn-fāl’ə-bəl) adj.
- Incapable of erring: an infallible guide; an infallible source of information.
- Incapable of failing; certain: an infallible antidote; an infallible rule.
- Roman Catholic Church Incapable of error in expounding doctrine on faith or morals.
I grew up amongst many christian religions, and the infallibility of the pope was most often brought up - they never declared the pope was not a good man, but they questioned that he would be infallible. In fact, the statement was often made that only christ was perfect when discussing this topic. I would also add that most protestants do not understand that infallible is currently interpreted as only in interpretation of doctrine and not that the pope is actually infallible. Communicating that point is necessary if you are trying to discuss this with a protestant as they can quote many historical references where a particular pope was not infallible outside from a pure sense (ie, Incapable of erring)
The other issue was the saints. Many protestant groups saw this as a form of idolatry.