I agree that religion, nationalism, ethnic identification, natural resources can be used to motivate large groups of people to fight.Politics and religion have always mixed. Whether religion is simply a motivational tool, it is still a horrific use of religion for nefarious purposes.
Have you being paying attention to #stopthesteal?
But seriously, I disagree with that statement. How many people have been fooled for centuries by mythical stories of burning bushes and stone tablets. People are easily duped by belief in the Sky Guy.
Humans are tribal animals, and have been for two hundred thousand years. It is always possible to find some angle to stoke tribal grievances. That is just a reality of the human condition and I do not think it can be laid at the feet of Jesus.
I just do not think that many people in the last four centuries are willing to die on the question of whether Jesus, Siddhartha Guatama, or Laozi had the better insight into transcendent truth. At least for the last 400 years, the true motivation for conflicts are natural resources, geopolitical hegemony, and nationalism.
As for stone tablets and burning bushes they come from the Jewish bible. I am not sure why a lot of people get mad at Christianity for sacred Jewish scripture.
The bible is supposed to be read metaphorically. That has been Christian doctrine for 1,700 years. It was not until the Protestant reformation and the rise of fundamentalist Protestantism that biblical literalism and biblical inerrancy became accepted practice in Protestant sects.