HoosierDaddy said:
“No other issue is left open to personal interpretation where so many people can have opposite conclusions and claim CHurch support.”
Not at all.
The question of how much to give to charity (which is a big deal in Christianity) is similarly elastic. We know we should give and that we must give, but there is no hard and fast percentage for every situation.
There is nothing unique about family planning in this respect.
The hard and fast stuff is the “do nots”–don’t commit adultery, don’t use artificial birth control, don’t murder, etc. The “dos” are much fuzzier.
No, not quite. The Church leaves open to how much you support but not IF you support. Rich or poor, starving or gluttonous we ALL must support. The precepts of the CHurch bind morally. And number 5.
5 The fifth precept (“You shall help to provide for the needs of the Church”) means that the faithful are obliged to assist with the material needs of the Church, each according to his own ability. The faithful also have the duty of providing for the material needs of the Church, each according to his abilities.
Clearly lays out that it is not acceptable to NOT provide. Now “according to ability” certainly guides how much but the idea of “nothing” is not an option. Now, of course this does not apply directly to procreation. Some cannot procreate. Some are not called to marriage and therefore not called to procreation. But IN a marriage, the intent to have children is implicit. So, a couple getting married in their forties would be taking the same vow as a couple in their 20s, teens, 30s, or 80s. And since when two people Cannot perform the act the Church generally holds back the sacrament. We can assume that a couple getting married in their forties could not get married with the full intent NEVER having relations or children. To express the idea that they are not open to life, would inhibit marriage.
(let’s not bring Josephite into this) lets just keep it simple for now.
Now you and I know in practice that selfish ABC live together premarital sex, never want kids couples get married in the Church all the time. Heck, I was one, and I am going to a wedding like this in June.

But, that does not make it theologically correct, though it is practical.
That is why I struggle with NFP as a concept. Again, not that I deny the legitimacy of the Church in this matter, but rather why the ambiguity is doing no one any favors in our marriages and our societies.
Moral ambiguity, or the fuzziness of your “dos” list does not define Holy or Unholy. The fact that people on CAF cannot agree about anal stimulation for foreplay does not change any type of sexual morality in God’s eyes. It does not excuse or even lessen any type of sin or selfish action that is not in tune with God’s will and calling for a person or a couple. It makes for interesting conversation, but settles nothing theologically. Which is my issue with the whole NFP deal. Nothing is like it. Nothing HAS been like it in 2000 years of the Church. Not tithing, not foreplay, not war, not murder, not theft. Black and white, good and evil, holy and unholy. That is the reality of the theology.
But like I said, the practicality of it makes perfect sense. That is why I cannot condemn NFP or those who for reasons known to them and God decide to not be open to life at any given time. I cannot reconcile it to the faith. But I also cannot condemn it.
Sigh.
I do believe that given the gift of time the Church will further guide and define these issues for us. 500 years from now, if Jesus has not come again yet, you can be certain that there will be future councils, and future encyclicals and future popes weighing in on this issue and guiding us. Too bad we will all be dead and our children (few though they may be) will also all be dead.