Golly!
WE PROTS have searched diligently for the phrase "Mother of GOD" as well.
Guess what; it ain't in the bible either.
Your serve.
But you know what we do find in the Bible?
Matthew 23: 8-10 But you are not to be called rabbi, for you have one teacher, and you are all brothers.And call no man your father on earth, for you have one Father, who is in heaven.Neither be called instructors, for you have one instructor, the Christ.
And that they explain away with their knee jerk canned responses.
So it goes to show that even if it were in the Bible spelled out with the specific words that they demand it be in, it would be irrelevant if they didn't want to believe it.
Cause clearly when something IS spelled out as specifically as they demand in the Bible, if they want to disobey it, they'll find some excuse to do so.