Im confused, you say that Catholics dont think the bible useful for daily living, yet when people use the scripture to point to an example of Mary being called the Mother of the Lord, you dismiss it as “Only” 1 person said it. Does that mean it is not valid? There are a lot of things in scripture said once but are considered valid, even things not specifically said are believed, such at the Trinity. But you have an actual person in scripture using the actual words Mother of my Lord, you dismiss it.
Jesus cannot be separated into parts. It has always been the teaching that he was fully God & fully man.He was not just a man walking the earth for 33 years. He is not just God who is the beginning & end. He chose to take on the characteristics of a man in the flesh, to dwell amongst us. I sure he could have just zapped himself here, fully formed man, but he didnt. He chose to be carried in the womb of a woman. To me, that is a pretty big deal.
Considering Jesus was a perfect, sinless man, he followed the 10 Commandments, including the honoring of parents. I do not want to stand before him on judgement day & have to answer the question of why I refuse to honor his mother & treat her decently, out of love for Him.
It takes nothing away from Jesus or God the Father or the Holy Spirit, to honor the 1 person in history, who has ever been given such an awesome gift. That tells me she must be pretty darn special to the Godhead & it would be disrespectful for me to degrade or dismiss her role in our salvation.
Just my 2 cents