Unfortunately, they cant, because heaven doesnt exist, the same way hell doesnt exist, the same way starwars doest really exist. We can imagine it. But it is not there. By Occams razor, we know that the simplest explaination is usually the right one, and my the anthropic theory, we know that this universe is perfect for us onyl because there are a multitude of universes and life that can can ask "why do i exist" can only ask it in those that are perfect for life. The simplest explaination is usually right and im sure u believers live by that rule in the rest of your lives. If ur kid goes missing u dont assume aliens took him, no matter how good a story it would make.