So is Luther's novel teaching of "the Bible Alone."
Why is his extra-Biblical teaching acceptable, while the teaching of Christ's Church is not?
Besides, the Bible doesn't reject extra-scriptural Apostolic teaching, the Bible commends it.
2 Thessalonians 2:15So then, brothers, stand firm and hold to the teachings we passed on to you, whether by word of mouth or by letter.
Finally, the Bible itself indicates the fact that Mary enjoys an exalted position in heaven.
Revelation 12:1A great and wondrous sign appeared in heaven: a woman clothed with the sun, with the moon under her feet and a crown of twelve stars on her head. She was pregnant and cried out in pain as she was about to give birth. Then another sign appeared in heaven: an enormous red dragon with seven heads and ten horns and seven crowns on his heads. His tail swept a third of the stars out of the sky and flung them to the earth. The dragon stood in front of the woman who was about to give birth, so that he might devour her child the moment it was born. She gave birth to a son, a male child, who will rule all the nations with an iron scepter.