Ok, first off god does do divine intervention once in a while. Remember a long while ago when a baby fell off the bridge onto sharp rocks and somehow survived with no scratches on him. As for people dieing because they believe, look at jesus, he went through some horrible crap for what he believed in. The question is would you renounce your beliefs just so you could live longer. That too would be a test to see if you truly believe or not. Also Jon f, god is not the one coming down here and killing our families and friends. The devil also intervenes in human life as well. The test would be to see if you would blame him for not saving them or something like that.
As for what happens to us after we die. It's all about what you choose to believe. You can believe we don't go anywhere and turn into energy or some crap like that or you can believe in a possible enternal life in heaven scenario. Which would you look forward to? The ideal of wanting proof defeats the whole purpose of belief. As I stated before, of course everyone would believe if they saw proof that god was real. There have been certain miracles, look at Moses or how jesus could cure the blind and things like that. It's hard for us to believe because there are rarely miracles like that nowadays. Also, too many people disregard that these events ever happened, but how would they know? Nobody was there, so it's up to us to believe.