Actually - Luther was devoted to the Blessed Mother . . .
"She is rightly called not only the mother of the man, but also the Mother of God ... It is certain that Mary is the Mother of the real and true God."
"St. Paul says 'God sent his Son born of a woman, ' These words which I hold for true, really sustain quite firmly that Mary is the Mother of God."
(Martin Luther, Martin Luther's Works, vol. 7, pg 592)
"This article of faith- that Mary is the Mother of God- is present in the Church from the beginning and is not a new creation of the council but the presentation of the Gospel and the Scriptures."
(Martin Luther, Martin Luther's Works, vol. 7, pg 572)
"It is certain that Mary is the Mother of the real and true God."
(Martin Luther, Martin Luther's Works, vol. 24, pg 107)