If a person is of Good will, and is truly seeking the Truth, God will not withold the Catholic faith from that person. He will even send, in a miraculous manner, the means of salvation to that person (Acts 8).
We are born with the law written in our hearts. Through sin we dull our conscience to distinguish what is right and what is wrong. A person who is in ingnorance may not be culpulable for not joining Holy Mother Church, but still has to answer to God for other mortal sins. Ignorance doesn’t save a person. God puts the Commandments in our hearts and it is up to us to accept His actual grace in our lives to lead us to the Truth…
Romans 2: 11 For there is no respect of persons with God. 12 For whosoever have sinned without the law, shall perish without the law; and whosoever have sinned in the law, shall be judged by the law. 13 For not the hearers of the law are just before God, but the doers of the law shall be justified. 14 For when the Gentiles, who have not the law, do by nature those things that are of the law; these having not the law are a law to themselves: 15 Who show the work of the law** written in their hearts, their conscience bearing witness to them,** and their thoughts between themselves accusing, or also defending one another,
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Inculpable or invincible ignorance has never been and will never be a means of salvation. To be saved, it is necessary to be justified, or to be in the state of sanctifying grace. In order to obtain sanctifying grace, it is necessary to have the proper dispositions for justification; that is, true divine faith in at least the necessary truths of salvation, confident hope in the divine Savior, sincere sorrow for sin, together with the firm purpose of doing all that God has commanded, etc. Now, these supernatural acts of faith, hope, charity, contrition, etc., which prepare the soul for receiving sanctifying grace, can never be supplied by invincible ignorance; and if invincible ignorance cannot supply the preparation for receiving sanctifying grace, much less can it bestow sanctifying grace itself. “Invincible ignorance”, says St. Thomas Aquinas, “is a punishment for sin”. (De Infid. q. x., art. 1.) It is, then, a curse, but not a blessing or a means of salvation.
But if we say that inculpable ignorance cannot save a man, we thereby do not say that invincible ignorance damns a man. Far from it. To say, invincible ignorance is no means of salvation, is one thing; and to say, invincible ignorance is the cause of damnation, is another. To maintain the latter would be wrong, for inculpable ignorance of the fundamental principles of faith excuses a heathen from the sin of infidelity, and a Protestant from the sin of heresy; because such invincible ignorance, being only a simple involuntary privation, is no sin.
Hence Pius IX said "that, were a man to be invincibly ignorant of the true religion, such invincible ignorance would not be sinful before God; that, if such a person should observe the precepts of the Natural Law and do the will of God to the best of his knowledge, God, in His infinite mercy, may enlighten him so as to obtain eternal life; for, the Lord, who knows the heart and thoughts of man, will, in His infinite goodness, not suffer any one to be lost forever without his own fault."7
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Pius IX has, on many occasions, condemned such liberal opinions. Read his Allocution to the Cardinals, held Dec. 17, 1847, in which he expresses his indignation against all those who had said that he had sanctioned such perverse opinions. “In our times”, says he, “many of the enemies of the Catholic Faith direct their efforts towards placing every monstrous opinion on the same level with the doctrine of Christ, or confounding it therewith; and so they try more and more to propagate that impious system of the indifference of religions. But quite recently – we shudder to say it certain men have not hesitated to slander us by saying that we share in their folly, favor that most wicked system, and think so benevolently of every class of mankind as to suppose that not only the sons of the Church, but that the rest also, however alienated from Catholic unity they may remain, are alike in the way of salvation, and may arrive at everlasting life. We are at a loss, from horror, to find words to express our detestation of this new and atrocious injustice that is done to us.”
Matthew 7: 13 Enter ye in at the narrow gate: for wide is the gate, and broad is the way that leadeth to destruction, and many there are who go in thereat. 14 How narrow is the gate, and strait is the way that leadeth to life: and few there are that find it!