When it comes to the nation vs. nation, my country vs. your country, it's a tough call, for me personally anyways. At the church I've been attending, the pastor did a sermon on violence and he said that when you look at what Jesus said, he really did preach non-violence to the point of being crushed underfoot and beaten. What you do with that is up to you I guess, where you draw the line, but that was the preferred solution, according to Jesus.
Thankfully, people throughout history haven't followed this to the T. If good people didn't fight back, there would be no good people left in the world, they'd all be dead many centuries ago.
But I guess it's important to remember that Jesus wasn't giving instruction to nations, he was giving them to individuals. It's difficult, I think, to take something that's meant to be dealt with on a personal, local level and then extrapolate that into hard and fast guidelines for what a nation should do when faced with conflict. The factors of scale and complexity add problems.
Anyways, when faced with real life conflict on your door step and in your community, each of us will draw our own lines in the sand; whether to lie down and take it, do some kind of passive resistance or join in the battle, and I think there will be people in all those areas who are Christians who will think they're doing the right thing, and that line is probably going to shift from situation to situation, too.
Side note on the statistics thing: I think it's pretty hard to classify a Christian any other way than to ask them if they consider themselves Christian or not. Not you, not me nor the census taker will really know the truth, because we don't know a person's life story, what has happened to them up to that point in their life and where they are in any kind of spiritual journey. None of us can judge, only God. I mean, who's going to decide whether somebody's "christian enough" to make the cut? So, asking "are you christian" is pretty much all we got to go on when you're trying to classify people in the quickest, most efficient possible manner.
Irregardless of what exact stats the author was quoting, his point was that there are a lot of christians in the US and there are a lot of gamers in the US and somewhere in there, there must be an overlap, of which the ToJ, Men of God and others are proof of.