Would you call Protestants heathens?

Christ said, “If a man will not hear the Church, let him be as the heathen.” Matt. XVIII, 17. He referred, of course, to a deliberate and willful refusal of a known obligation. If a man knows that the Catholic Church is the true Church, yet refuses to obey it, he will certainly be as the heathen before God. But Protestants who are ignorant of the truth of the Catholic claims, and who believe in Christ, trying to serve Him as best they can, would not be regarded as heathens. An exception is made in their case because of their lack of knowledge and because of their good dispositions.

Radio Replies Volume 1 by Rev. Dr. Leslie Rumble MSC and Rev. Charles Mortimer Carty