Is it haram to talk behind a non-muslim's back (to backbite)?

Dear Brother / Sister,

It is haram to talk behind a Muslim’s back (to backbite). It is definite.
However, as for the non-Muslim, there are two cases:
1 — The non-Muslims with whom we are in a state of war.
2 — The non-Muslims with whom we are in a state of peace. (Like the Christians and Jews of today.)
It is not haram to talk behind non-Muslims with whom we are in a state of war. It is necessary to talk badly about them to make the war favorable for us. There is no sin in doing it.
However, the case about non-Muslims with whom we are in a state of peace is not the same. It is permissible to talk behind their backs only by differentiating between them and their attributes. That is, it is not permissible to talk behind their backs as the perfect creatures that Allah created but to talk behind the back of the unbelief that they added to those creatures so that they will be afraid of unbelief. That is, it is not permissible to talk behind the back of people but their attributes.  
We learn form the fatwas of Ghazali that there is no drawback to talking behind their backs because the aim is not to talk behind the back of people but to state that the wrong beliefs are bad.
As for the minorities among Muslims:
— All of their situations and states are under the guarantee of Islam like Muslims. The justice of the exalted Islam does not regard it permissible to talk behind the back of people that are under its protection. 
Islam does not permit itself to fall into disrepute. Talking behind their backs except for the situations stated above is haram. If one has talked behind their backs, he should apologize to them and ask for forgiveness.

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