We are open to life if it happens. But we are not planning to have children. At this point in our lives we do not want children. My question, which you avoided is, if the Church is so black and white with this issue, why don’t they ask you flat out before you get married, “Health willing, are you going to have children? If not, we can not marry you in the Catholic Church.” Instead, they ask if you are open to children. And I would say to that, if it happens, yes we are open to children, but we are not planning to have children. If that answer to you means, we are not open to children, then I ask again, why doesn’t the Church just come out and ask “Are you going to have children in this marriage? If not, you can not get married in the Catholic Church”.
There is a substantial difference between actively trying to have children, letting nature take its course (not preventing, not trying, not avoiding), avoiding to have children via NFP or total abstinence, and preventing to have children via artificial means (pill, condoms, IUD, vasectomy, …). The Church’s stand on the issue is very simple. You are not required to be actively trying to have children, but you are not to enter the marriage with the intention of avoiding to have children (via NFP, or artificial means) for the time being and grudgingly accepting them if they come as a consequence of you not being careful enough.
Also, the Church cannot ask you “are you going to have children in this marriage?” as nobody can answer that question. Children are a gift from God, not something that can just be had if you wish it enough, as many couples suffering from the infertility can attest to. What Church is really asking of you is the openess to fertility (
vatican.va/archive/ccc_css/archive/catechism/p2s2c3a7.htm) and to lovingly accept children that come as a result of this fertility, not a vow to have as many children as humanly possible by any natural or artificial means. You can also imagine a situation in which people are open to children, for example via adoption, but still not open to fertility.
The end point is that the teaching is very clear. You do not have to agree with it, you do not have to live by it, but it is what it is. You have a free will and you will live with the consequences of your choices.
Frankly, I am somewhat puzzled by this thread. The opening question “Can a couple who don’t want to have children get married under the grace of God?” has only one very simple answer: “no, not in the Catholic Church”. Yet somehow, the debate managed to go on for 34 pages so far. The fact is that having children in marriage is good and normal, infertility for whatever reason is a cross. Marrying with the intention of not having children ever is abnormal, albeit sadly not uncommon in today’s world. To be married with the intention to avoid having children forever is like a man who becomes a catholic priest, but he always avoids saying the words of consecration (or not saying them properly) when saying the mass. After all, there are all those readings and singing and prayer and fellowship, so the consecration is just an unimportant detail, right?