As the Catholic Encyclopedia states, "By the sixteenth century, as evidenced by the spiritual struggles of the Reformers, the image of Mary had largely eclipsed the centrality of Jesus Christ in the life of believers." (Robert C. Broderick, ed., The Catholic Encyclopedia, revised and updated; NY: Thomas Nelson Publishers, 1987, pp.32,33)
And which speculates that a further reinforcement of Marian devotion, “was derived from the cult of the angels, which, while pre-Christian in its origin, was heartily embraced by the faithful of the sub-Apostolic age. It seems to have been only as a sequel of some such development that men turned to implore the intercession of the Blessed Virgin. This at least is the common opinion among scholars, though it would perhaps be dangerous to speak too positively. Evidence regarding the popular practice of the early centuries is almost entirely lacking...,” (Catholic Encyclopedia > Devotion to the Blessed Virgin Mary)
Autocratic presumption excludes the need for actual warrant and conformity to Scripture.
Actual Catholics and what they believe...
Bonaventure: …the gates of heaven will open to all who confide in the protection of Mary. Blessed are they who know thee, O Mother of God, for the knowledge of THEE is the high road to everlasting life, and the publication of thy virtues is the way of ETERNAL SALVATION . Give ear, O ye nations; and all you who desire heaven , serve, honor Mary, and certainly you will find ETERNAL LIFE.
Ephem: …devotion to the divine Mother…is the unlocking of the heavenly Jerusalem.
Blosius: To the, O Lady, are committed the KEYS and the treasures of the kingdom of Heaven.
Ambrose: …constantly pray ‘Open to us, O Mary, the gates of paradise, since thou hast its KEYS.
Fulgetius: …by Mary God descended from Heaven into the world, that by HER man might ascend from earth to Heaven.
Athanasius: …And, thou, O Lady, wast filled with grace, that thou mightiest be the way of our SALVATION and the means of ascent to the heavenly Kingdom.
Richard of Laurence: Mary, in fine, is the mistress of heaven; for there she commands as she wills, and ADMITS whom she wills.
Guerric: …he who serves Mary and for whom she intercedes, is as CERTAIN of heaven as if he were already there…and those who DO NOT serve Mary will NOT BE SAVED.
Anselm: It suffices, O Lady, that thou willest it, and our SALVATION is certain.
Antoninus: …souls protected by Mary, and on which she casts her eyes, are NECESSARILY JUSTIFIED AND SAVED.