From that I would conclude that all war is religious in nature.
I think it's more accurate to say that NO war is religious in nature. Wars are HUMAN by nature. Part of living in a fallen world, I suppose. (YMMV, of course...)
Once again, search and peruse the information online related to Just War Theory. It will hopefully 'splain things in a manner far superior to that which I am able to.
:) ttt