Mary needed a Saviour.
But beyond that:
This is another made-up title to separate people by the RCC.
You're reading too much into the issue, this one at least between Catholics and non-Catholics should be a nonstarter. The word "saint" is merely the English rendition of the word Santa which means Holy. Holy Cross, St. (aka Holy) Saviour, Holy Father, Holy Ghost, The Holy People of God (that's supposed to be us btw)... The saints in Heaven are merely the holy ones in Heaven, it's a matter of convenience to refer to those in Heaven as saints, it's not a Catholic conspiracy.
Not really. The RCC has "elevated" certain people to "sainthood" have they not? Saint Paul, St Peter, St Teresa, etc.
There is nothing in the Bible where Paul or Peter gave direction to call certain people, outside of followers of Christ, as saints.
Again, it is an attempt by the RCC to set up a false hierarchy differentiating people into groups that doesn't exist in the Bible.
And now, O Lord, we, Thy servants, and with us all Thy holy people, calling to mind the blessed Passion of this same Christ, Thy Son, our Lord, likewise His Resurrection from the grave, and also His glorious Ascension into heaven, do offer unto Thy most sovereign Majesty out of the gifts Thou hast bestowed upon us...
In Latin that passage reads:
Unde et mémores, Dómine, nos servi tui, sed et plebs tua sancta, ejústdem Christi Fílii tui Dómini nostri tam beátæ passiónis necnon et ab ínferis resurrectiónis, sed et in cælos gloriósæ ascensiónis: offérimus præcláræ majestáti tuæ de tuis donis, ac datis...
The word "sancta" means holy, it is applied to us on earth as well as those in Heaven, this is not a hill worth dying on, it's not "an attempt by the RCC to set up a false hierarchy differentiating people into groups that doesn't exist in the Bible"