I am guessing that you love this guy, would like to marry him, but are worried that his current beliefs would be an impediment to a good marriage. You’ve gotten lots of advice and IMO, because there is no way to predict success in marriage, you can ignore all the advice that implies that you shouldn’t marry him. I think you are looking for a way to marry a guy that is an “atheist”. I emphasized atheist because he doesn’t sound like one to me. He certainly has some sound Catholic pro-life beliefs.
Success in marriage depends, in order, on the following factors: 1. love (respect for one another’s needs), 2. compatibility (respect for one another’s identity); 3. friendship (being comfortable in each other’s company); and 4. a sense of humor. I am not saying that all these factors are required; they are merely the factors that made and still makes my marriage of 60 years so delightful.
Okay so, where is religion? It is my experience that if you don’t make an issue of it, it will solve itself. Here is my experience: My wife and I have 8 children, of the 3 boys and 5 girls, 7 are married. One of our boys is a priest. One of our boys and 3 of our girls married non-Catholics. All 7 marriages have been successful; the marriages are now 36, 34, 31, 29, 27, 23, 18 years duration. The 4 non-Catholics have become practicing Catholics. They converted after, 21, 15, 12, and 1 year of marriage; in other words, of their own accord. All my children and their spouses are practicing Catholics.
All 22 of the grandchildren went to at least 8 years of Catholic school, 4 didn’t go to Catholic H.S. (because of unavailability). All my children and their spouses graduated from college. All the husbands had jobs that allowed the wives to be stay-at-home-mothers. As far as I can tell, all our grandchildren, now ranging in age from 14 -34, are growing up normally. I don’t know that all are practicing their religion, that is, of course up to them, but the seed was well planted.
IMO we cannot predict the success of a marriage based on religion alone. One must be judicious in selecting a mate. I suppose the probability of success is highest if both practice the same religion (see factor 2 above), but that certainly is not a guarantee. I believe that the probability is lowest when both have no religion. And if one practices their religion and the other doesn’t have one, there is still a possibility for success if the one practicing a religion follows these rules: (1) never try to convert him/her, don’t even mention religion; just practice yours sincerely; (2) never criticize the other’s family; (3) agree to raise the children in the religion of the practicing partner; (4) if a Catholic, get married in church, even if it is not at a nuptial Mass; (5) be patient, and trust in the Holy Spirit.
God bless you,
Yppop