[Quix]

The comparison was not about birth.

The comparison was about the incapacity of the lesser to give glory to the greater in such an arrangement.

I think many Roman Catholics et al may well know that somewhere in the recesses of awareness.

[Cronos]

The comparison was about the incapacity of the lesser to give glory to the greater in such an arrangement.

the lesser gives glory to the greater -- in the example you gave you cannot say "Professor Higgins to call Liza Doolittle the mother of Professor Higgins?" because Liza Doolittle was NOT the mother of Prof. Higgins. Liza Doolittle was moulded by Prof. Higgins and her ability to perform in society was a winning point for Prof. Higgins (remember the bet at the start of the movie?)

Similarly, calling Mary as Mother of God glorifies GOD for choosing to come down to us as Jesus Christ, wholly man and wholly woman. God came down and was born of one of His creations! (for Mary was/is just a creature, not divinity in any possible way)

The Ark of The Lord is hailed, and that gives glory to what it contained, to what it pointed to -- to God.