Puuh-lease!! (1)Satan does not fear flesh and blood.(2) Mary is dead. (3) You have no Biblical basis to show that Satan fears Mary. None.
Sacred Scripture says that the thoughts of our hearts will be revealed because of Mary. So when you hear someone speak with tenderness about Mary, their heart is revealed. It is a sign. When they lament her sorrows at the cross. It’s a sign. If they say, “Ha! Mary’s not that big of a deal - she’s a sinner like us all,” then this to is a sign. Their heart is revealed.