Well, we ARE missionaries in this world. I know that in the area we're planting our new church, a vast majority (I don't remember the exact number) are Catholic so we will be ministering to those. We're actually having a man come to our church at the end of the month (we'll be missing it because of vacation but we'll get it taped) who will be teaching on witnessing and ministering to the Catholics in our area.
Around here, I find that most are not "religious" Catholics but "cultural" Cathoics. In other words, they don't really believe everything the church teaches but they were baptized there and it's all they know. MANY don't go to church except on special occasions or they go because "they are supposed to". I do have some friends who are more "religious" Catholics who are quite involved in the church and believe all it teaches and love to be in the walls of their parish. They fully practice the Catholic faith and minister with the church as well (one is a deacon looking to become a priest and the other is a cantor who works with multiple churches in the area). There are a few others I know like them who I attended Catholic school with but they are certainly not in the majority.
The Sister Superior (I always wondered what she was superior to?) used to vilify most of my Catholic family in the parish by calling them "Cafeteria Catholics" Come to think of it, she was very accurate because they all picked & chose what they wanted to believe & ignore. And there was allot they ignored in order to keep peace. Guess thats how you get by belonging to them for 2000 odd years.