All Catholics belong to the preisthood of the faithful by virtue of the sacrament of baptism. The ministerial priesthood is reserved to those Catholic men who have received the sacrament of Holy Orders. Ministerial priests never cease to belong to the priesthood of the faithful.
Is this some distinction you're drawing, as if non "ministerial priests" do cease to belong to the priesthood of the faithful? I'd be interested to know how you arrived at that.
If membership in the priesthood is all by baptism, is there no falling away other than official, church recognized excommunication (I presume you buy the excommunication exclusion--but maybe you don't)?
HF
Exactly, we just don’t take it seriously, do we?