I’m in a heated debate with a few Agnostics and Atheists regarding Homosexuality and they’re bringing up the Mosaic Law and how we like to ‘pick and choose’ which laws (of the Old Testament) we follow.
That atheists are correct. We - well, the Church - pick and choose which laws (that are not divine or natural) we follow.
Can someone help me out with understanding why we follow the Ten Commandments but not the other Mosaic Laws?
We follow the ten commandments because some of them are required from us by Jesus and the Apostles. The others commandments we follow because the Church says so and because they are natural law.
Can someone help me out with understanding why we follow the Ten Commandments but not the other Mosaic Laws?
Because, Moses’ covenant has been abolished, abrogated, annulled and does not apply to us or anyone else (Galatians 3-5). The law was set “because of transgressions, until the seed (Jesus Christ) would come to whom the promise had been made” (Galatians 3:19).
Paul, Galatians 3:10-11: “[A]ll who rely on works of the law are under a curse”, “no man is justified before God by the law”.
Galatians 5:4: “You are severed from Christ, you who would be justified by the law; you have fallen away from grace.”
Chrysostom, Homily on Romans, 6:12: “Yet surely Paul’s object everywhere is to annul this Law. And with much reason; for it was through a fear and a horror of this that the Jews obstinately opposed grace.”
Homily on Galatians, 3: “And so while no one annuls a man’s covenant, the covenant of God after four hundred and thirty years is annulled; for if not that covenant but another instead of it bestows what is promised, then is it set aside, which is most unreasonable.”
Justin Martyr, Dialogue with Trypho, 11: “Now, law placed against law has abrogated that which is before it, and a covenant which comes after in like manner has put an end to the previous one.”
Cathechism of Trent, 3, the Third Commandment: “[A]fter the abrogation of the Law of Moses, all the Commandments contained in the two tables are observed by Christians, not indeed because their observance is commanded by Moses, but because they are in conformity with nature which dictates obedience to them.”
Cathechism of Trent, 3, Decalogue: “It is most certain that we are not bound to obey the Commandments because they were delivered by Moses, but because they are implanted in the hearts of all, and have been explained and confirmed by Christ our Lord.”
Pope Urban VIII, Profession of Orthodox Faith: “[W]e profess that the legalities of the Old Testament, the ceremonies of the Mosaic Law, the rites, sacrifices, and sacraments have ceased at the coming of Our Lord Jesus Christ; they cannot be observed without sin after the promulgation of the Gospel.”
Pope Piux XII, Mystici Corporis Christi, 29-30: “[T]he New Testament took the place of the Old Law which had been abolished.”
Just to clarify, there are many covenants in the Old Testament, the Mosaic covenant is one of them, and they should not be confused with Abraham’s covenant. The covenant of Abraham has been fulfilled, unlike the other covenants which have been abolished, and has become the new covenant. The confusion between the covenants has sadly led many American Protestants to believe that the Jews are a chosen people, instead of Israel (which is now the Catholic Church).