I would say he isn't because at the end of his song "time for war" he says "i believe in nothing, not in Satan not in God". No christian in their right mind would say they don't believe in god The song is This is War/100 Suns. He say "I believe in nothing, not in SIN not in God I have no idea what he is.
He seems to be some what spiritual. He has said he likes Buddhism. He is a songwriter christian or not, when you writea song it doesn't mean those are your beliefs.
They seem to steer clear of that question, which is good. The album is all about personal conflict.
I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.