The Orthodox call Mary the Theotokos, which is the Ark which carried God. Yet they are some free (if not encouraged) to deny the existence of the Ark, or the truth of Exodus and the Ten Commandments written on the tablets of stone that were carried in the Ark of the Covenant.
By denying the Exodus and the Ark they essentially deny the basis upon which Mary became the Ark, the Theotokos. If there was no Ark, then there was no God carrier in Mary. The Orthodox undermine their own beliefs by their disbelief.
Theo means "God" and tokos means "birth-giver." There is no Ark in it.