I think that his saying god is on our side is just a justification and way of saying my buddy god would agree. But this is inherrent in any war. When the Nazis were slaughtering Jews and trying to conquer the world, the British decided to stop this. And I'm sure they said "I fancy God is with us", but they didn't go to war because of god or religion. Any religious party in a war is going to say that their god supports them, but that doesn't mean that the war is for god.