It's pretty obvious if you look at the world around you: God is all-powerful and nobody can prevent His will from being done. No matter what you do in life, we all end up as fly food when we die: Obviously that must be God's will. And why? Because God is a fly and made flies in His image and humans were put here to be fly food when we die, and to punish those flies that have sinned.
You know how there's always that one fly you cannot swat no matter how hard you try? That fly is sinless and is living in a state of grace and cannot be killed. The fly you swat was a fly that has sinned and God decreed that you should be able to kill it to punish it for its sins.
That is our purpose in life: To punish those flies that have sinned, and to be fly food when we die.
You want more proof? There are more flies on Earth by weight than there are people. Clearly God favors flies above people, because He made them in His image. And this is why life sucks so bad for people: God doesn't care about us because He's a fly. You want a better life after death? You want me to tell you what you have to do for God to accept you into heaven? Well, guess what: You're out of luck. We all are, because God doesn't care about you or about me because He's a fly and we're just garbage-making machines because flies love garbage.
The bright side is that you wouldn't want to go to heaven anyway, because it's all just flies, and in heaven they're all saved so you wouldn't be able to kill even one.