My husband and I have been married now for 13 years. No, its not that long but it allows you to experience many issues that arise in life.
When we got engaged, we were both active JW's in good standing- aux pioneers and on the building construction team. We waited for weeks before we told anyone in the cong we were dating. Only two persons close to us knew. When we finally told members of the congregation they were shocked and surprised because we kept it such a secret.
Needless to say, the elders and everyone one wanted to get into our business, have talks with us about being moral, helping out with the wedding (so they could be invited), etc.
Fast forward to the wedding date getting closer. I let the bethelite elder (good friend of my husband) who was going to give our marriage talk know that once my husband and I got married, they (the elders) were not going to be in our personal maritial business. He was shocked that I, a sister, said that to him. But I meant it.
I also told him what I wanted the theme of our marriage talk to be centered on, that if he took more than 30 minutes on the KH stage giving our marriage talk that I was going to walk off the stage and go to the courthouse and get married. And he knew I was serious.
The point, my husband and I kept the elders and many others in the congregation out of our personal and maritial business.
I feel what keeps a marriage together are common interests and hobbies , respectful intimacy between both partners, working together financially, united front when raising children, understanding each other's need for "space", humor, tackling problems that arise and not tackling or fighting each other, and yes if both partners have the same spiritual interests-that helps. But that is not a panecea for a healthy and stable marriage. Respect for each partner's religious beliefs or non-beliefs are essential.
That being said, as partners get older, their interests and goals may change, which includes spiritual interests and goals. I stopped going to the meetings before my husband decided to stop going regularly. So we learned through dialog to respect each other's decision and not push our feelings or ideas on each other. We never stopped each other from going or not going, and we did compromise on attending the meetings, assemblies, etc. Marriage is day-to-day compromises by both partners. So adjustment is key to remaining married.
I firmly feel that a belief in even the basics of spirituality is essential in a marriage, but all the other factors are also necessary to make it work.
Note: There a many persons that are not affliliated with any organized religionm but their marriages have lasted for decades. It's how partners respect, treat one another , and grow personally that will determine in the end if their marriage lasts.
Ronin1