I'm Agnostic, but still...a have a question for Christians...

I find it interesting how, according to the latest studies, 60-76% of Americans identify themselves as Christians, which represents the majority of the population, yet a larger percentage (Not by much, but a little as of 2011) is pro-choice and we're constantly involved in war. Um, don't WE vote on things in this country? I mean, if the majority of our population is supposed to believe in peace, maintaining life, and basically doing as Jesus supposedly did, why are we constantly at war and killing unborn babies again? Someone…please…remind me.