Hello. First, allow me to make clear that I do not identify fully with any particular Protestant denomination as of yet, though I go to a Methodist church. Theologically, I might be closer to Luther. (I’ll have to look into that more.) Mary is kind of a gray area right now.
The Virgin Mary is the mother of Christ (from which she derives her infamous title, mother of God,
Theotokos). At the least, she is a devout woman who clearly helped in the bringing of Christ to this earth. In the Church? She is a member of the communion of saints and a good role model in many instances.
Don’t take offense to this because I don’t intend any. I would not say that the universal Church of all Christians has Mary as its mother – Christ Himself founded it, and we are the Bride of Christ, intended to spend eternity with Him through His atonement and love.
Here’s the potentially offensive part. I object to Mary herself being our mother. Mary can be our “mother” in that she is a role model, and a spiritual mother just like a priest or bishop can be our spiritual father. Pope Francis commented that the Christian who does not take Mary as his mother is an orphan. I am aggrieved by this statement (and I do not normally get fired up over these things).
I take God as my Father (and, of course, my earthly father in a different sense).
He adopted me through Jesus Christ (Ephesians 1:5). Jesus Christ is also my friend if I choose to follow His commands, and He will confide in me (John 15:14-15).
For me, Mary may have been a perpetual virgin like Luther and the others believed, and the virgin birth of Christ is a fact of orthodoxy,
but I would never say that any human, save for Jesus Christ, is sinless now.
Jesus is making a historical statement to St. John in particular. He is telling John to look after His mother, to take care of her. John clearly did, because he “took her unto his own home” from that hour onwards. Jesus is being a good son, ensuring that His mother is taken care of. To this day, don’t we try to ensure that our parents are taken care of?
There’s some Protestant commentaries here on that passage:
biblehub.com/commentaries/john/19-27.htm
God bless and I hope this helps.