^^^ This is Nestorianism. Mary is Christotokos, not Theotokos, they wrongly say.
As for the 50-50 bit, never heard of it said like that before.
However, I did hear a famous Protestant radio celebrity state at my old evangelical church that Christ was not born from one of Mary's eggs. That's heretical, too, because if Christ is not really the son of Mary, he's not the son of David or the son of Abraham or the son of Adam and not a Jew or even a real human person.
I thought he was only the son of David through Joseph?
12 After the exile to Babylon:
Jeconiah was the father of Shealtiel,
Shealtiel the father of Zerubbabel,
13 Zerubbabel the father of Abihud,
Abihud the father of Eliakim,
Eliakim the father of Azor,
14 Azor the father of Zadok,
Zadok the father of Akim,
Akim the father of Elihud,
15 Elihud the father of Eleazar,
Eleazar the father of Matthan,
M, the husband of atthan the father of Jacob, 16 and Jacob the father of JosephMary, and Mary was the mother of Jesus who is called the Messiah.