Well, if HInduism has castes, you Christians and Muslims have hatred of non-believers and condem them to hell. Both of you commit genocides against humanity (Red Indians, Slavery of Blacks, forcing Jews to live in Ghettors). Then you have blood sect warfare: Shias killing Sunnis, Protestants killing Catholics.
Hindu caste system seems totally harmless compared to bloody wars between Christianity and Islam (Crusades and Jihads).
