The thing that stops Protestants in their tracks about being "saved" or not is the following:
You're not saved until you're dead.
Sometimes you have to repeat yourself because they can't cope with the concept.
You're not saved until you're dead.
Tell them that so-and-so is a Doctor of the Church, and wait for their comment.
Then tell them that to become a Doctor of the Church you have to die and it is proclaimed posthumously. They'll be really disappointed. Then tell them again:
You're not saved until you're dead.