why do christians judge and disdain the love concept of other religions ?

[Memo]

First christian should learn that Love is a something complex, relative and anyone has no a tool to meause degree of other's love towards people. Christian always judge the love concept of other religions. Wha a stupid and selfish action ! Their idea is totally selfish and you know that selfish ideas are not consistent with the words of Jesus ( peace and blessings upon Him). Because of this fact , anyone should act on justice , not love. For example, when somebody attacks to your country to kill and destroy your wifes, your children ( just like usa attacks to Irak and other muslim lands), how could you talk about love towards the guys attacking you ! Quran points this reality by giving the right of fighting against these guys. So all christians argue that Islam does not include love. The other point they should learn is that a real Muslim is more merciful than a real christian. For example , Spain was slaying Jews, the Ottoman safed them without thinking any profit . If you consider many real christians countries next to Spain did not say anyhing about genocide, they understand the reality. In conclusion we should focus on the both sides of glass ; focus on the general actions of any group , not only crimes of stupid members of that group. First christians should learn this concept, and then talk about love !