When they go to fight, so they believe God wants them to be victorious or kill the other side? Or are they thinking, "Wow, based on my beliefs, I shouldn't be here!" Nope. Instead, they kill people and still believe that God is with them, although they aren't allowed to kill, otherwise they'll go to hell.
Well, according to Christianity, if they ask for forgiveness they pretty much don't go to hell, and even if they don't ask for forgiveness they still get forgiveness if they believe in CARPENTER. Yeah, Christianity is kind of an easy religion.