Do you know the difference between a doctrine and a dogma?
OK, which is the Immaculate Conception?
No, I don't know the difference between a doctrine and a dogma. Is that relevant? I assumed that since you said that those who believe otherwise would be doomed to hell ... whether I call it a doctrine or a dogma is not germaine to my eternal destiny.
I don't want to split hairs over terminology ...
Explain why my proof is invalid.
Catholic Answers says the IC is a doctrine.