There is no sin where people do not know that they are doing wrong. Sin requires the person’s consent in wrongdoing. I won’t quote the “Catechism of the Catholic Church on this,” but you could check this out yourself there. And actually I recall what Saint Paul said in his Epistle to the Romans. Among earlier men when there was no law (he was speaking of the law of Moses) there was no sin, though there was sin after the law,. Which is to say sin requires knowledge that you are doing wrong. There is no sin when such a couple believes that they were validly married (though they were not).
I would like to impose a bit, because this is a topic that interests me. I would like to ask anyone to provide me with the sections of the Catechism or other sources which lead to the conclusion: “There is no sin where people do not know that they are doing wrong.”
On its face, this idea seems to cause a problem with the Savior’s prayer from the Cross: “Father, forgive them, for they know not what they do.” Luke 23:34 (Douay-Rheims 1899 American Edition.)
If the formula suggested were correct, then there would be no need for Jesus to ask for forgiveness – since there would be no guilt and no sin.
Rather, it seems that there was guilt and there was sin, but that it was forgiven as a kindness, in view of their ignorance. To formulate it in the other way would be to mistake mercy for justice, and to assume that God is not entitled to punish when He is offended, even by the ignorant.
I am reminded of several lines from the Church’s Book:
4: Do not say, “I sinned, and what happened to me?” for the Lord is slow to anger.
5: Do not be so confident of atonement that you add sin to sin.
6: Do not say, “His mercy is great, he will forgive the multitude of my sins,” for both mercy and wrath are with him, and his anger rests on sinners.
7: Do not delay to turn to the Lord, nor postpone it from day to day; for suddenly the wrath of the Lord will go forth, and at the time of punishment you will perish.
Sirach (Ecclesiasticus) 5:4-7 (RVS-CE)
It seems to me that this could be an important matter, if some people are too easily assuming that they are free of sin, or that ignorance of their offenses protects them from justice, as though mercy were their right, rather than the Lord’s or the Church’s gift and indulgence.
Agnus Dei, Qui tollis peccata mundi, miserere nobis.
John Hiner