Well in history in general, I'd go with the Romans. The Romans are the one who caused the spread of Christianity and affected everyone today by making it the state religion. The way Romans spread Christianity is that the Romans persecuted early Christians. They'd feed them to lions, burn them alive or crucify them. Although the Romans were the ones hurting the Christians, the Romans were actually helping the Christians. Every persecuted Christian would make another beleive, making others know that these Christians must really have a real God- Jesus. After Rome fell, Christianity still spread more and more...and still is. Did you know that about 1/3 of the world is Christian? Amazing, right?