Ave Maria, gratia plena,
Dominus tecum.
Benedicta tu in mulieribus,
et benedictus fructus ventris tui, Iesus.
Sancta Maria, Mater Dei,
ora pro nobis peccatoribus,
nunc et in hora mortis nostrae. Amen.

Christians venerate Mary. If you don't believe that Mary can pray for you to God, then you do not believe in any Saint, which goes against Biblical traditions. End of the discussion.
>inb4 idols
one they are not idols, but foci; no one believes Mary inhabits the icons and statues dedicated to her, just like nobody believes Jesus inhabits the crucifix or the cross; this unlike the pagans, which literally had the notion of spirits and objects being one, like the Roman Numen. Second of all, Mary is still alive as a Saint on God's side, so it's no graven image, just like depictions of Jesus.