Two major groups are Catholics and Orthodox.
The two groups were Theravada Buddhism and Mahayana Buddhism.
How about the Christians and Muslims
In the mid 600
The Mahayana and the Therauda
Mahayana and Theravada
Into Catholic and Protestant, although there are some Christian groups such as the Mennonites who existed as spiritual descendants from earlier anabaptists who were not part of the Protestant Reformation. They existed before then, and were to a degree persecuted by the Protestants, particularly Luther.
The two groups split in the most simple terms, because of fighting over their lineage to Muhummad, the Prophet.
Catholicism and Portestantism.
Many groups fought, but if the Holocaust were to be split into two groups, they would be the victims and the perpetrators.
I have no knowledge or Christians saying anything of the sort.
Mensheviks and bolsheviks