"War is not to be waged in the name of God!"
-- Pope Francis
... Um, if our cause is just; if we are acting in defense of life and liberty; if we are standing in the way of oppression and tyranny; then it is not only our right but our duty to wage war. And if we pray to the One True God® before the engagement, then I guess we can be said to be waging war "in the name of God."
It is also reserved to the laity to make prudential judgments about things like what (political) course to take.
No matter what Bill Donohue thinks.
The Islamic State sharia-or-bust movement is wrong, horrible, evil. But we oppose them because of what they do -- not because they say they're doing things for Allah.
I just hope Pope Francis was taken out of context. (Actually I think that about him a lot.) Otherwise somebody seriously gots ta 'splain things to that boy. (You listening, Holy Spirit?)