Devotion to Mary, instead of worship of the Lord is idol worship, an effective weapon of the Deceiver.
When I start hearing of reports that these Muslim spiritual miracle seekers that go to Marian shrines are turning from Islam and become followers and believers in Jesus Christ, then it might peak my interest. Jesus said more blessed are those who see not, yet believe. We are not to seek after signs. That is why only by faith is it possible to please God.