I'm sorry, but the idea that some god living in the midst of nothing, decided to create an entire universe for people is far more absurd than, "Why does life exist?", I don't know, chaos. In an eternal chaotic system, it is perfectly reasonable to suspect periods of immense order and practically everything that could happen would happen over an eternity. We may simply be experiencing a blink of eternal chaos. It's just that, we are experiencing everything so quickly and limitedly that we cannot glimpse it's purpose; or there is no purpose. Everything is just cause, effect, cause, effect - the same amount of energy has existed for eternity and it just keeps on bumping into itself creating all kinds of interesting systems, like small and nuclear bonds, solar systems, biologoical systems and saterday morning cartoons. Certainly there is no reason to suspect that this universe was created by conscious moral god. If so, I very much disapprove of his creation skills.
I have a few complaints; the development of the knee and the frailty of the human body are just a couple I'd like to mention. Oh yeah, why not make just one friggin planet? If heaven exists, in some other plain, why not just start us off there to begin with?