My wife was one, and the answer is that I led her away. I had married young, with the typical disastrous result. By the time I met my wife I was 30, and we discussed a Catholic wedding, but due to waiting on a possible annulment, etc., we didn’t .
I was raised in a pretty religious Baptist family, but after being married for years ( going to neither Catholic or Baptist together) I began studying the Catholic faith, spent at least three or four years at it. Both of us were religious, but didn’t attend church, although kids were baptized Catholic, etc. After a lot of soul searching, I became serious about becoming Catholic, but didn’t even know how, in a classic manner did a google search. By a chain of coincidences (?) pulled up RCIA classes, which started in a week, along with the church my mother in law attended, which just happened to have classes on the only day I was off in time from work to go. My wife and I never discussed it, I signed up to take RCIA, and wrote her a note with the anniversary present I gave her. I took the classes, got an annulment ( which in my case wasn’t hard to argue), went to confession, came into the church at the Ester Vigil. My wife has new enthusiasm for the Church, it has been a long path, but worth it.
As a footnote, my family was supportive of it, rather than trying to talk me out of anything.
