IN the sixteenth century, even amidst their many divergences, the so-called Reformers agreed in utterly rejecting all the honors paid by the Catholic Church to the Blessed Virgin Mary, on the grounds that such veneration of the Mother detracted from the supreme worship due to her Divine Son. Four centuries have more than sufficed to show the result of so doing: the Son has followed the Mother! The descendants of those who refused to Mary the title and rights of Theotokos —–Mother of God—–refuse to Jesus the title of Son of God in the traditional sense of the term. Many reject His Godhead altogether, placing Him merely at the head of the line of great moral and social world-teachers; others still retain the word “divinity” with respect to Him, but for them it is no longer synonymous with “deity.”
Read more here: Catholic Tradition: Mary.