Try the Hebrew instead of English or Latin. Both dulia and latria are covered by the same Hebrew...
Thou preachest unto yond proverbial choir. Try telling that to all the English-only Christians who assume "worship" always and only means the kind of worship that is due to God alone.
Creating an image and bowing to it is idolatry according to the Bible.word.
So would you also object to Christians bowing before a crucifix or a statue of Jesus? Or would it be easier to understand in that case that it's not the image of a strange god that we have fashioned for ourselves?
Mary is not a strange goddess either. She is neither strange (we adore her specifically because she is the mother of Jesus) nor is she a goddess (the heresy of Collyridianism, in which Mary is worshiped as a goddess, was condemned as early as 375 by Epiphanius of Salamis in his Panarion and the church at large has never assumed a contrary stance on the matter).
If you would say that it violates God's commandments even when it's an image of Jesus and not of Mary, once again, we do not believe that the statue itself is divine, we do not adore the statue itself, and we certainly do not serve the statue. Our gestures toward the statue communicate our feelings about the person who the statue represents. For example, we definitely would not consider it a good idea to attack and destroy a statue of Jesus because this implies far more than desire to destroy a statue, it would be an expression of hostility toward Jesus himself.
Compare with the incident in Exodus 32.
All that being said, I, personally, don't think Mary wants us to bow down to her, even if we understand that she is not divine. I am sure she appreciates other gestures of respect and would consider it appropriate for us to kneel when joining her in prayer, but I think she would probably consider it more fitting to bow down before her son.
However, if men and women once bowed before mortal kings and emperors as a sign of their respect and trust, I see no reason why Mary would be unworthy of the highest degree of adoration that one human may show another.
Praying to the dead is necromancy.
Attempting to communicate with Mary using a ouija board would indeed be a terrible idea. Asking Mary to pray for us is no more sinister than asking a friend here on Earth, however. God is the God of the living. If the souls of the faithful are not in Heaven with God now, then Jesus was crucified in vain. The doctrine of soul sleep is completely without any scriptural justification and seems to have been contrived solely for the purpose of providing some defense against the idea of the intercession of saints. I'm perpetually amazed at how far God's anarchists will go in compromising the integrity of their own beliefs and constructing bizarre doctrines of bits and pieces of scripture merely in order to retain their pointless dispute with the big bad RCC.