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This 5-year-old Greek Orthodox child is most certainly a member of the visible Church ... and this has been taught by the Magisterium.  This is precisely where the wheels come off LaCosaSalza's false theology.  By having been baptized, this visible Sacrament renders him a member of the Visible Church ... until such as time as he professes heresy and or schism (upon having reached the age of reason).  Until such as time as this child reaches the age of reason, he's incapable of breaking from the Church by the profession of heresy and schism.

Congratulations, though, as with your articulation of the invisible Church you have just embraced all of Vatican II.

This 5-year-old Greek Orthodox child is most certainly a member of the visible Church ... and this has been taught by the Magisterium.  This is precisely where the wheels come off LaCosaSalza's false theology.  By having been baptized, this visible Sacrament renders him a member of the Visible Church ... until such as time as he professes heresy and or schism (upon having reached the age of reason).  Until such as time as this child reaches the age of reason, he's incapable of breaking from the Church by the profession of heresy and schism.

Congratulations, though, as with your articulation of the invisible Church you have just embraced all of Vatican II.

As Monsignor Fenton clearly details, Pius XII rejected the notion of an invisible Church that is not co-extensive with the visible Catholic Church.

St. Robert Bellarmine clearly laid out the criteria for belonging to the Visible Church.

Communion in the Sacraments, profession of the true faith, and submission to the Holy See.  This 5-year-old has been joined to the visible Church through the Sacrament of Baptism.  While he does not actively profess the faith or submission to the Holy See, these are there through the infused virtues of faith and charity.  While these are essentially visible things, they can be there virtually or by habit, even if not always actively manifested.  This is akin to my example before of human beings being essentially soul and body, even while they are in Heaven (currently) without happening to have an actual body.  And the same thing applies to the visibility of the Church.  While the Church and the hierarchy are essentially visible, this does not preclude that for a time the See might be vacant or that there may be confusion about where the actual hierarchy are (such as during the Great Western Schism).

You are conflating Rahner’s visible/invisible distinction with the Catholic distinction between body/soul.

They are not the same thing.

The difference between the two is that for Rahner’s “anonymous Christianity,” sanctifying grace is either not required or unavoidably ubiquitous, whereas the body/soul distinction is predicated upon possession of sanctifying grace.