The facts are that the Christian church has been used to endorse war efforts throughout its history after becoming a social force in 
Western civilization.     The Catholic church has standards which allow it to define a 'justifiable' war.

https://en.wikipedia.org/wiki/Just_war_theitsy

So we may have a difference in terms here.   Using the term holly war was a mistake. (Spanish Inquisition) Western nations have regularly sought endorsement from the Christian church to support war.  The height of mixing religious ideology with state objectives was in Europe and the power of the Catholic church.

When church and state become synonomous, (as in many Muslim nations), this will, IMO, do far more to distort the message of Jesus or Allah , than it will to modify the behavior of a state that is looking to build a very Human kingdom on earth.

Muslim nations are corrupting their faith to justify very human desires for power and control.    There are Muslims followers that feel the same way.