And that is a huge error.
I am used to seeing Catholics use arguments for praying to Mary and other “saints” to ask them to pray to God for us. I think those are un-biblical and anti-biblical for many reasons. But a friend put a meme on my Facebook page with this that had an even more obvious error:
POPE JOHN PAUL II’S PRAYER TO OUR LADY OF LOURDES
( This prayer was said during the Holy Father’s August 15, 2004 visit to Lourdes, France. The Pope asked her among other things to “be our guide along the paths of the world.”)
Hail Mary, poor and humble Woman, Blessed by the Most High! Virgin of hope, dawn of a new era, We join in your song of praise, to celebrate the Lord’s mercy, to proclaim the coming of the Kingdom and the full liberation of humanity.
Hail Mary, lowly handmaid of the Lord, Glorious Mother of Christ! Faithful Virgin, holy dwelling-place of the Word, Teach us to persevere in listening to the Word, and to be docile to the voice of the Spirit, attentive to his promptings in the depths of our conscience and to his manifestations in the events of history.
Hail Mary, Woman of sorrows, Mother of the living! Virgin spouse beneath the Cross, the new Eve, Be our guide along the paths of the world. Teach us to experience and to spread the love of Christ, to stand with you before the innumerable crosses on which your Son is still crucified.
Hail Mary, woman of faith, First of the disciples! Virgin Mother of the Church, help us always to account for the hope that is in us, with trust in human goodness and the Father’s love. Teach us to build up the world beginning from within: in the depths of silence and prayer, in the joy of fraternal love, in the unique fruitfulness of the Cross.
Holy Mary, Mother of believers, Our Lady of Lourdes, pray for us. Amen.
Carefully note these phrases: “Teach us . . .Be our guide . . .help us . . .Teach us . . . ” These are all roles of the Holy Spirit, not Mary. This prayer is blasphemous and an indictment of the Mariolatry of the Roman Catholic Church. Their other arguments for praying to the dead can be thoroughly refuted as well (see Satan knows where your lost keys are), but this prayer by a Pope alone shows how wrong they are on this topic.
If you ascribe any roles of the Trinity to anyone other the Father, Son or Holy Spirit, it is un-Christian.
P.S. As Neil Kirkland noted in the comments, Muslims make a similar error with Mary, thinking she is part of the Trinity instead of the Holy Spirit.