Nonbelievers are not the ones who start wars in the name of God.
Trying to get smart again. Use your context clues, you know, the ones you learned in elementary school. The meaning of "fight" in that context does not mean war. It means argument. As in, whenever someone says something positive about religion, nonbelievers, on ATRL for example, like to start arguments.
Could God sell over one million copies of his debut? Appear on Forbe's World's Highest-Paid Musicians? Spawn multiple number one singles? Break iTune records?
Use your context clues, you know, the ones you learned in elementary school. The meaning of "fight" in that context does not mean war. It means argument. As in, whenever someone says something positive about religion, nonbelievers, on ATRL for example, like to start arguments. 
It's the truth in Christianity. Now if you don't believe it, that's understandable.