AFAIK I have never made a general statement on what "Protestants believe" -- too much variation, for one thing. I have asked individual Protestants what they believe or what their church teaches on a particular point and I've discussed or argued that point; I have certainly never insisted to a Protestant (or anyone else) that I knew more about what he believed than he did.
You do know, don’t you, that many of us were RAISED Catholic? You know, baptized, First Communion, confirmation, confession, catechism classes, Catholic family, Catholic classmates, Catholic co-workers?
Pinging some former Catholics, knowing I’ve missed some. Sorry to those I’ve missed.