It's all really just one BIG test if you ask me. I belive God put humans on the world as a test to see really how fast the human race can really just turn their back on him. The ones who endure the test and live good respectful lives will be rewarded at the end. Those who are just pure ignorant and belive the world revolves around themselves will end up paying in the end. It's really kind of simple if you ask me.