When Catholics say any prayer in reference of Mary, we say, "Pray for Us."
Any of the Holy Trinity, we say, "Have Mercy on us."
See the difference?
"Holy Mary, Mother of God, pray for us sinners..."
It's all about the wedding feast at Canaan when the Son would not refuse his Mother's request.
Non-Catholics will never understand our relationship with The Blessed Mother so why bother...
Yes, but I still disagree