Yes but not Christians. See there's a difference between Christian nations killing people and Christians killing in the name of God. The crusades were in the name of God and killing witches was in the name of God. Random wars were not. On the other side Muslims always kill in the name of Allah, or they aren't allowed to kill at all.
No actually socialism is telling the people you are giving people the ownership of the means of production through worker cooperatives and democracy, then ruling over them with a central government.