Hi Petronius,
I do not judge those Christians you refer to. They may indeed be in the life of grace. But any Christian life which appears outside the Church must be connected to her. "3 Careful to keep the unity of the Spirit in the bond of peace. 4 One body and one Spirit: as you are called in one hope of your calling. 5 One Lord, one faith, one baptism. 6 One God and Father of all, who is above all, and through all, and in us all. 11 And he gave some apostles, and some prophets, and other some evangelists, and other some pastors and doctors: 12 For the perfecting of the saints, for the word of the ministry, for the edifying of the body of Christ: 13 Until we all meet into the unity of faith and of the knowledge of the Son of God, unto a perfect man, unto the measure of the age of the fulness of Christ: 16 From whom the whole body, being compacted and fitly joined together, by what every joint supplieth, according to the operation in the measure of every part, maketh increase of the body, unto the edifying of itself in charity." (Eph. 4)
This is what Pius XII himself says in another segment of the same encyclical letter: "We ask each and every one of them to correspond to the interior movements of grace, and to seek to withdraw from that state in which they cannot be sure of their salvation. For even though by an unconscious desire and longing they have a certain relationship with the Mystical Body of the Redeemer, they still remain deprived of those many heavenly gifts and helps which can only be enjoyed in the Catholic Church".
I cannot receive speaking of "your framework or group". In the NT I see one united and visible Church that was promised to endure until the end of the world, to which the promises of sanctification and salvation were given. To suppose that belonging to her - and I find her today to be the same Catholic Church - is only a very minor matter seems foolhardy to me.