No it has not. Face facts.
You quoted Mark, and Mark's Gospel is of traditions related to him. Basically, the tradition of Mary being conceived without sin is handed down just like the tradition of which Mark wrote. The traditions of Mary and Jesus are comparable.
What can be regarded as a man-made tradition concerning Mary is that Catholics attend Mass on the day her Immaculate Conception is commemorated. Another man-made tradition: Each Sunday Christians celebrating Christ's life, death, and resurrection (and listening to the traditions concerning him) is a man-made tradition. Celebrating Christ's birth is a man-made tradition.
Yes!