Osama bin Laden, the person, more likely serves the function of a stand-in. Compare the new terrorists with partisans or conventional terrorists in Israel. These people often fight in a decentralized manner in small, autonomous units, too.
Christianity will go. It will vanish and shrink. I needn't argue with that; I'm right and I will be proved right. We're more popular than Jesus now; I don't know which will go first - rock and roll or Christianity.