The problem arises with the syncretism of goddess worship (the slow invasion of what was once powerful and shoved aside by Christianity). Whether the object of worship is Diana, Athena, Semiramis, Astarte...each and all have tried to elbow their way into Christianity and corrupt it.
This is the tension regarding Mary and her position in the Church. How do we make sure that our honor and devotion to Mother Mary is not subverted by those demon goddesses who seek the same?
This is really only a possibility in the fevered imagination of anti-Catholic zealots. It simply doesn't exist in Catholicism or Orthodoxy.