So when did the split officially happen between RC and Orthodoxy? And do you believe that there was only one church operating before the split? That there were no more churches operating than Catholicism?
The Great Schism, as it was called occured in 1054 AD.
The only “churches operating” were the Nestorian and Arian schismatics, that denied the dual nature of Christ, and refused to ratify the Holy Ecumenical Council of Chalcedon.