Hezbollah defends Christians?
Yes, in Syria they have been fighting against Sunni terrorists who are persecuting Christians. After Hezbollah drove al-Qaeda and its allies out of towns like Qusayr, Maloula and Yabroud, Christians were able to return.
Christians in Syria and Lebanon and in a defacto alliance with Hezbollah and other Shiites against Sunni jihadist groups.