I think to sum things up, we are called to be open doors with prudence.
It is easy to be taken advantage of, to be hurt by others but to it is hard to love, to give oneself to God and neighbor. …
This is what the catechumenate and post-baptismal catechumenate are for - inclusion of those who are “a bit patchy”, those of us who are nowhere near knowing whether we are excluding ourselves from God’s grace or not. Finding out what Scriptures actually say, whether they say anything about how we are called to relate or not, whether they say anything about how we are supposed to trust God in life or not. Finding out what evangelisation is, by being on the receiving end of it.
Someone once said to me that Jesus envisaged a four-year catechumenate (Lk 13:6-9). And that the groups of fifty that the crowd sat down in, and the amount of food left over after it had been shared, illustrate catechumenate and evangelisation (Mk 6:34-44).
Reputedly, after periods of persecution, former apostates rejoined the Church through the catechumenate (I don’t know the source for this).
Anyone who doesn’t drop out can presumably be assumed to be included as the other posters have said - let God sort out tares from wheat, goats from sheep, in His own time. Also, droppers out, receiving a seed sown, can come back later in life (as some believe the rich young man who “had gone away sorrowful” later did).
The II Vat Council called for these parts of the Church to be set up. Every recent Pope without exception has called for these parts of the Church to be set up.
Should we pray for the bishops and their helpers, that this will be fulfilled to the benefit of the needy of heart, despite our fears of incompetence and tactlessness?