All true believers are saints in true Christianity.
The word “saint” comes from the Greek word hagios, which means “consecrated to God, holy, sacred, pious." It is almost always used in the plural, “saints.”
Acts 9:13 But Ananias answered, “Lord, I have heard from many about this man, how much evil he has done to your saints at Jerusalem.
Acts 9:32 Now as Peter went here and there among them all, he came down also to the saints who lived at Lydda.
Acts 26:10 And I did so in Jerusalem. I not only locked up many of the saints in prison after receiving authority from the chief priests, but when they were put to death I cast my vote against them.
Romans 12:13 Distributing to the necessity of saints; given to hospitality.
Romans 15:25 But now I go unto Jerusalem to minister unto the saints.
Romans 16:15 Salute Philologus, and Julia, Nereus, and his sister, and Olympas, and all the saints which are with them.
Ephesians 1:1 Paul, an apostle of Jesus Christ by the will of God, to the saints which are at Ephesus, and to the faithful in Christ Jesus.
Funny, in all your citations, none of them use the word ‘all’.
This wouldn’t be just yet another protestant interpolation?
“All true believers are saints in true Christianity”