The bottom line is that we are obliged to seek Catholic spouses. And it is not statistically prudent to expect a solid conversion while courting.
Sometimes the way God arranges things - you don't find what you are looking for where you expect to find it. And put it a different way, those guys both were searching for something more than what they had. What initially attracted them to my sisters was the fact both were very Catholic and faith and practicing that faith were entwined in who they were. It's what got them talking in the first place.
Even today - you look around your church, and I'll bet you will see more than a few young people sitting back in their pews instead of going to communion every Sunday. <= Maybe I'm judging people when I shouldn't, but sometimes I wonder if these kids have any idea how fortunate they are to have access to the sacraments.
My brothers-in-law both are good men for whom practicing the faith and seeking the sacraments are very important to them.
These things happen by the grace of God - and befriending and guiding people to the true faith is what you are supposed to do - if it brings souls to Him.
Neither of my sisters were seeking spouses at all, by the way. I know it was something they prayed about from time to time and I know my mom was praying. They met and married the men they were supposed to marry. That's all.
Perhaps that is Webster, but a Catholic definition is that "religion" is Catholicism. If it is not Catholicism it is NOT religion. False means it is NOT, and NOT means it is false. And it is pretty silly if I were to say I am a bishop of the United States, and for you to say, "well, yes you are a bishop, but you are a false one." That really is just modernist-type of double-talk.
I can't work up the energy to really get worked up about things like this... it is enough for me to simply say "such and such is a false religion". It is right to the point and truthful.