This is the best post I have seen on this topic so far! I have a deep respect for your convictions about the morality of using another form of birth control. NFP can be used selfishly, and strictly as a birth control, and that is just as sinful, as using artificial contraceptives, like the pill, or condoms. If a newly married couple decides that they don’t ever want to have children, but they will use NFP strictly as a method of birth control …that is sinful. But really, what is the difference using NFP as strictly a method of birth control by a couple who don’t have ANY children…or say, a couple who have 2 children, and decided that is what they wanted all along, and from now on they will do exactly the same thing the couple is doing who have no children?? From morality’s standpoint there is no difference whatsoever! If the couple did the right thing, and kept their activities open to life, but later they reverted back to a selfish position, just as the couple who have no children, then how do they follow the Church’s teachings, when in fact they are closed from procreating life??
The fact is, NFP is a very good method of birth control if a couple follows strictly the rules of the NFP, about a woman’s infertile period. . If used correctly, NFP has a success rate of well over 98%, which is better than the artificial contraceptives have. But it is the intention of the heart which renders the action of every couple morally acceptable, or wrong. Therefore the intent of the heart should be the main focus in judging the act. And that takes NFP off the hook. Just as Jesus said, before he began his ministry…“Those who look upon a woman lustfully, are just as guilty, as those who commit adultery”