ROFL........
Post of the day.
Again, other than a small minority of the Anabaptists--the fringe groups of the Reformation, none of the Protestant Reformers believed that, and nor do the great majority of grateful Protestant Christians up to the present day.
Mainstream Protestants have never claimed membership in their bodies was a requirement for salvation, personal faith in Christ is...whereas, as evidenced here: "You are hell bound, generally speaking, yes, by the fact of your being separated brethren." (written above by a traditional RC), mainstream Romanists do.
Protestants with an understanding of the invisible Church, headed up only by Jesus Himself, are far more CATHOLIC (or universal, the meaning of the word) in their beliefs on who is a Christian, than the Church of Rome has ever been.