My original question was:
If a Protestant or Greek Orthodox Christian sincerely believes that he is in the true religion and a Catholic comes along with Church documents and the Bible in hand and shows him what he considers to be the truth, that is, the Catholic faith; can that person who is not Catholic after he is shown the Catholic faith, be saved, even if he rejects the Catholic claims because he believes sincerely that it is not the truth and that he is not sinning against his conscience in rejecting the truth?
When does invincible cease to be? And, I have heard that Karl Keating on the radio show state that if one does not believe in the Catholic faith after a demonstration then he is not held guilty for not becoming a Catholic if he considers the Catholic faith as not from God.
Also, ByzCath quoted: Fr Alexander Schmemann who was an Orthodox Theologian – is he saved? He rejects and knows of the Catholic faith?
Is there salvation outside the Catholic Church?
Did not Paul VI revoke the excommunication of the Orthodox Church in 1965?
Did not John Paul II call Martin Luther a Great Theologian?