Was the adoption of the Marian Dogma due to miracles, visions, any signs or any other guidance?
To give you a very simple explanation, for the purpose of simple analogy, let us consider the very First Dogma uttered by Peter that he never read from scriptures nor heard in the synagouge, because it was not written in scriptures nor teaches by the Jews ...
Catholic dogma is a divinely revealed truth, proclaimed as such by the infallible teaching authority of the Church which is based on sacred Scripture and sacred Tradition.
What Is Dogma?
The Greek word dogma originally meant "opinion," but it has come to mean something much more specific.
The current understanding of "dogma" arose in the 1700s ...