To the Catholics Mary is God; in fact there is a movement to make her a "fourth" member of the trinity. That is for those that don't know math.
Those attributes that are to be ascribed and attributed to God alone are ascribed to Mary.
Omniscience: Mary is considered to be all knowing. She must be when all the members of the RCC world wide pray (and many silently) to Mary to know what their innermost thoughts are. How would she know their prayers which are deep in their thoughts. Not every one prays aloud. In fact how does a mute person pray? Since when, did Mary a Jew, learn all the languages of the world? She is omniscient? All knowing now?
This attribute belongs only to God. Not even John admitted he could understand all the languages he heard when he heard those in heaven speaking in every language.
Revelation 5:9 And they sung a new song, saying, Thou art worthy to take the book, and to open the seals thereof: for thou wast slain, and hast redeemed us to God by thy blood out of
every kindred, and tongue, and people, and nation;
--Could he understand every language he heard? He does not admit that he could.
Omniscience belongs only to God.
The RCC makes Mary a God by making her omniscient.
2. They make Mary omnipresent.
Mary is one individual. She is in the grave. Her spirit is in heaven. What God allows her to see is not up to you to decide. Heaven wouldn't be heaven if the saved in heaven could watch continuously all the heartache and sorrow that their loved ones had to endure, and all the wickedness that goes on in this world millennium after millennium. What kind of heaven is that when the saved only get "horror movies" to watch?
But the RCC has Mary flitting about from person to person so she can hear them pray. How else would she know what they pray, unless she is there, present to here them pray. She must be omnipresent.
3. They make Mary omnipotent. She is able to do anything (just about). That is, she is able to answer any prayer that the Catholic prays, even to the granting of salvation. She is the redemptrix. Prayers of salvation are frequently found among the literature of Catholic saints.
This makes Mary, a God. This makes Catholicism polytheistic, like Hinduism.