Who is this woman called Saint Mary aside from being the mother of our savior? Is veneration of her idolatrous? What is her role in the salvation of mankind?

Our Lady Saint Mary by J. G.
H. Barry, D.D is a collection of inspiring sermons presenting a devotional analysis of the life of the Blessed Virgin. Presented in poetic and prayerful form, the book reflects on Liturgies of the Catholic Church to illustrate the prevalence of the address of devotion to the Blessed Virgin throughout Christendom. The poems are selected with much the same thought, and have been mostly gathered from medieval sources.