God can use his mother to reach people. I've experienced it and so have many others. She is the mother of God.
Christ worked his first miracle turning water into wine because his mother asked him to. He obeys his mom.
Paul said "it is no longer I who live but Christ". Mary can say the same.
A practice doesn't have to be in Scripture to be legitimate.
According to the scriptures, God is eternal, a Spirit Being with no beginning. He does not have a mother. Mary was the physical mother of Jesus (while He dwelt in the physical flesh only).
Mary acknowledges that God is her Savior and her attitude in no way indicates that she considers God to be a tyrant....
And Mary said:
“My soul magnifies the Lord,
And my spirit has rejoiced in God my Savior.
For He has regarded the lowly state of His maidservant;
For behold, henceforth all generations will call me blessed.
For He who is mighty has done great things for me,
And holy
is His name.
And His mercy
is on those who fear Him
From generation to generation. He has shown strength with His arm;
He has scattered
the proud in the imagination of their hearts.
He has put down the mighty from
their thrones,
And exalted
the lowly.
He has filled
the hungry with good things,
And
the rich He has sent away empty.
He has helped His servant Israel,
In remembrance of
His mercy,
As He spoke to our fathers,
To Abraham and to his seed forever.”
Luke 1;46-55