These three sections of Go and Make Disciples acknowledge the situation of Catholics who were once with us but no longer express an active faith life.
The bishops concede some of the many reasons: poor formation, alienation from Church teaching or people of the Church.
GMD 40 contains the “official” stance to those who are inactive in the practice of faith:
As a community of faith, we want to welcome these people to become alive in the Good News of Jesus, to make their lives more fully a part of the ongoing story of salvation and to let Christ touch, heal, and reconcile them through the Holy Spirit. We want to let our inactive brothers and sisters know that they always have a place in the Church and that we are hurt by their absence—as they are. We want to show our regret for any misunderstandings or mistreatment. And we want to help them see that, however they feel about the Church, we want to talk with them, share with them, and accept them as brothers and sisters. Every Catholic can be a minister of welcome, reconciliation, and understanding to those who have stopped practicing the faith.
Where we have the least difficulty: devising “programs” for returning Catholics. The most difficulty? With the understanding that active Catholics can be those ministers of welcome.