What is material and what is not? When the world is the end and God is the means to attain that end, that is material. When God is the end and the world is only the means to attain that end, spirituality has begun.
If we are willing to act violently in pursuit of a peripheral interest, everyone can be certain that, when a vital interest is at stake, we will be still more violent. 'Credibility' is defined as the willingness to kill a lot of people now for a not very good cause to assure the world that we'll kill a lot more people if we can find a better one.
A fool, a fool! I met a fool i' th' forest,
A motley fool! a miserable world!
As I do live by food, I met a fool
Who laid him down and basked him in the sun
And railed on Lady Fortune in good terms,
In good set terms, and yet a motley fool.