You dare to say that no marriage outside the Church is a true marriage, that the Catholic party is living in sin, and that the children are not acceptable in decent society?

You make one mistake. The Catholic Church does not say that the children are not acceptable in decent society. Civil society is regulated by civil law, and a marriage legal in civil law obtains legal effects. Children of such a marriage are legitimate and acceptable in civil society. But whilst the marriage is regarded as legal by society, it is not valid in conscience for a Catholic, and such a person lives in sin. A marriage which civil law regards as valid need not necessarily be valid in God’s sight. No state on earth could force me to say that a definite civil law is infallibly the law of God, and no state could possibly prove such a claim to infallibility.

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