[quote="PaulinVA, post:5, topic:230642"]
Well, we have a serious reason, so we must avoid pregnancy.
That said, how do you think babies are conceived? Do you think God makes a positive "choice" every time a sperm and egg meet and implantation occurs? He has a "plan" for each of us that involves the number of children a woman has, and children are only created as part of His plan.
Or, do you think that God created a biological process for us to use to be co-creators with him? The biological process simply works the way God created it - sometimes a child is created and sometimes a child is not created.
Paul, I think that you and I are on the same page with regard to God/parents/babies. Though it has been a very long time since I was in the position of having to decide whether to use NFP or not, it is still a subject that I find of great interest, particularly the moral and philosophical aspects.
I believe that God allows human parents to take part in His creation through human biological processes, but not that He decides when conception will or will not occur in each and every instance, though He does infuse each newly conceived human with an immortal soul.
We are all subject to the ramifications of original sin and the sorrow and imperfection that entered the world as a result; thus, miscarriages happen and some babies are born with birth defects. We have also been given free will, and the bad choices we often make lead to babies conceived out of wedlock, born addicted to crack, or at low birth weight. These things happen due to our fallen nature.
I also believe that God answers prayer - sometimes with a "yes", sometimes a "no" - and that He is not a disinterested party to what happens in our lives. Hence, women thought infertile sometimes conceive, and babies predicted to be born with infirmities are sometimes not.
If a couple believes they can adequately (not necessarily lavishly) provide for a large family and chooses not to use NFP, more power to them. I think, however, that "leaving it up to God" is more accurately "leaving it up to natural biological processes created by God", in most instances (allowing for the occasional miraculous intervention, which I fully acknowledge.) This approach requires us to take full responsibility for the results of our own actions - something that we all must do, in any aspect of our lives, as mature Christians.