In 1854 the Catholic Church proclaimed that Mary was born without sin.
Their reasoning was if Jesus was born in a womb that had sin in it, the sin then would be passed onto the Child in the womb.
But the problem is Mary was born in the womb of her mother who was a sinner. You would think then the sins were passed onto Mary. The Catholics did a run around this by proclaiming God keep Mary free from the sin in her Mother.
According to the Catholics, God HAD the power to keep Mary free from sin, but yet God needed Mary's help to keep Jesus free from sin. Do you see where the Catholics are going? They are actually teaching God needed the help of Mary, that God was unable to keep His only Son free from sin without the help of Mary!
This is why today Mary is Worshiped by the Catholics as their God.