Christians have actively participated in whiping out that "wing of Christianity", thank you very much. Actually, there is an even more venerable wing of Christianity that had beencompletely whiped out by the Catholics long before 
The entire history of Christianity is thehistory of whiping oot other Christians: usually in a bloodthirsty fashion. In fact, one would think that killing Christians is, in fact, the main Christian doctrine.
That's not unusual as a phenomenon.
Hence Sunni v Shia violence in Islam.
Or why Leninists hate Trotskyists more than they hate anybody else across the rest of the political spectrum.
