The Gremonik scriptures were written by, oh surprise, Gremonik. A guy (?) who was alive during Ajora’s time, in which his/her gender would not be that easy to disguise. Any severe transformation of the story would obviously happen once the generation that witnessed most of it would be dead and the changes would be hard to examine.
Mary was not the Child of God, the spotlight and deification were all given to a man. Trying to argue that the Catholic Church (And many other religions) hasn’t always been male-centric is like trying to argue the sky is pink plaid.