In my opinion they would be heretics for denying a teaching of the Church, formal or informal I do not know.
I have a question:
BOD in reverse:
I watched one of those Christmas movies last night. To make it short: girl meets boy, Catholic parents plan for the Roman Catholic priest to come speak to the couple. Priest asks the young man, what religion are you? Jewish, he says.
The girl states, but he is going to convert, (lying).
Priest wants to baptise the young man in a few days, along with the new baby born to a sister of the girl.
This Jewish guy tells the girl when they are alone, "no way, I am not getting baptised, next week, along with the biby".
She says, just do it, for the sake of my parents, it doesn't mean much anyway, just a cermony. (sigh!)
Then I fell asleep.
My question is, if this Jewish guy did go along with the baptism, although against his desire for it. Is he baptised, would original sin be washed away?