That's not true. I did not use it in the plural. I called in the "Book of Revelation". And, no, I am not a Protestant.
Maybe not, but some of your comments give the impression of being a sola scripturist.
Regardless, this obsession with Mary’s heart is not a teaching found in the writings of the Church Fathers. Therefore, it is NOT according to tradition, much less according to the Bible. This sacred heart stuff is, however, found in the writings of a heretic.
Firstly, is a devotion an obsession in your opinion?
Second St Luke tells us
"But Mary kept all these words, pondering them in her heart."
"And he went down with them, and came to Nazareth, and was subject to them. And his mother kept all these words in her heart."[Luke 2:51]
Does your "orthodox" religion have any sort of antipathy to "devotion to a single body part—even Mary’s"?