The important issue is not when certain groups lost sacramental grace, but where is the One, Holy, Catholic, and Apostolic Church. Outside of the one Church there are no sacraments, only sacramental forms.
I am a member of the Church of Russia. My Church disagrees with you.
Here is another side to the matter .... the historical and present day Russian synodal teaching and canons as regards Roman Catholic (and Miaphysite) sacraments.
It can be summarised succinctly by saying that it is the true Body and Blood of Christ which a Catholic or Miaphysite priest gives to his parishioners and the Pope and his bishops are genuine bishops.
This overview is from Archpriest Alexander Lebedeff, the senior most priest of the Russian Church in the West. (I have placed his messages in a group which allows public access.)
The Russian Church and Catholic Sacraments #1
The Russian Church and Catholic Sacraments #2
So, does this mean that I (along with all my other fellow Catholics) am *not* anathematized, and a heretic?
JM, the Confused
It seems to be an area where we are going to have to live with these paradoxes for some time to come.
We certainly are in agreement about that, Father
My life has been full of paradoxes and over the years (I am not too much younger than you), I have learned to deal with them, and to even "make friends" with them, not infrequently being quite comfortable with them, if that's the right term to use. A case in point is my ecclesial status. If some in Orthodoxy consider me and my fellow Catholics to be "outside the Church" or anathematized heretics, I can easily live with that, though I may not "like" it. I can because I know that God is greater than that, that His Mercy is Infinite, and it will be Him, not this Orthodox bishop, that Pope, that netodox layperson, or whoever, who will be my Judge. I trust, too, that with His Grace we will, one day, be reunited.
Hope you have a wonderful, merry, and most blessed Christmas!