Does anyone believe that it is possible for a Protestant to die in the state of grace? If yes, would he be saved?
I say yes, because although to the world he died a Protestant, but in the eyes of God he was a Catholic.
I understand what you're saying and I somewhat agree.
It would be a lie to call them a Protestant, because they are Catholic, though.
This is in certain circuмstances.
All under the age of reason, but who have been baptized are Catholic and in the state of grace, even if they're being raised as Protestants. Once they hit the age of reason and continue their lives in heresy, they leave the Church and are no longer in the state of grace.
Someone that hasn't been accepted into the Church, though wish to enter by having the will to become Catholic though die before they enter can be incorporated into the Church. Although they may have been considered Baptist by their friends and family, they were no longer one because they accepted the Church as the True Church and Her teachings.
A Protestant can't willingly accept heresy and be in the state of grace.