BruceK,
This man you are debating is not worth your time. He is dishonest and is not even considering a single thing you say. You should call him on his discourtesy and wash your hands of the debate.
That being said, there are several points that go together to show the difference between NFP and contraception. Unfortunately, each principal must be applied in order for the whole truth to be understood. I will number each important point. If he doesn’t concede one, there is no point in going on to the next as he isn’t able to understand it. So lets get back to moral theology 101.
1.Some acts are inherently wrong. That is, by their nature, they are contrary to authentic love of God, self, or neighbor. There is no scenario in which committing these acts can be licit. An example is abortion. Committing such an act is always an offense against God. The Church has always affirmed (most boldly in Casti Connubii and HV as well as the regular teaching of the Church throughout history) that Artificial Contraception is inherently wrong and therefore can never be used licitly.
Code:
If he is honest, he will acknowledge that at least this principal is not open to debate among Catholics.
2.Some acts are inherently neutral. That is, by their nature, they have no effect upon the friendship between God and man. Any given instance of such an act must be judged by the circumstances. An example is eating. Eating can be good and fasting can be good depending on the circumstances.
People misunderstand what NFP is. It is several acts. Each individual act is the act of “not having relations with your spouse on a given night” which no one in their right mind would say is immoral in and of itself. If that act where inherently wrong, it would logically follow that EVERY married couple is obliged to have relations EVERY night. Clearly it is not inherently (this is the word to use) wrong.
Any honest man should be able to acknowledge that it is at least theoretically possible for it to be licit to not have relations on a given night.
3.Things that are not inherently wrong, can still be wrong in certain circumstances. Starving yourself and gluttony are both immoral.
All this means is that NFP can be abused and that abuse is sinful. DO NOT get into an argument about what constitutes abuse of NFP until he has accepted the principals behind all 3 points.
If the Church where to say that Contraception is ok now but that it wasn’t ok in the past, that would imply that either: 1. God changed his mind (an easily rejected proposition) or that 2. the Church was wrong on an issue of faith and morals for most of it’s history. If he claims #2, then there is no reason under the sun to remain Catholic as the guidance of the Holy Spirit has been proven faulty and therefore all teachings of the Church are called into question. If 2 is true, then it is decicively proven that the Catholic Church is NOT the one true church. He hasn’t understood logic this far though so I don’t expect him to understand this one.
One of the things that I think is important is that he has a ridiculously silly view of the Catholic Church. Then he claims that this silly view leads to self evident logical proofs.
We have a hierarchical Church. It is theoretically possible to have the entire Church be wrong except for the pope. (this would be complicated and it would presuppose that all the wrong members of the magisterium do not condemn the pope’s correct teaching – again, don’t get too deep in this) The proposed fact that 95% (A number that is as ridiculous as most of his dishonest statements) of Catholics in the US disagree with the Church means NOTHING more than that 95% of the Catholics in the US are wrong. It really is that simple.
Good luck,
~ Red Beard