Christianity Parallel Theory
My christianity theory:
Ryan Reynolds is more or less God/ Jesus Christ.
He made the world, he lived in it, he didn't want to go but was reminded by angels (the other "characters") that he has a higher purpose so sacrifices his life in this world even though he didn't want to (just as Christ didn't want to go before he died on the cross but knew he had to for the benefit of the world.) And lo, the final scene shows that the world is better without him.
Thoughts?
I could go in to a lot more detail but once you start thinking about this idea it seems to fit in to place quite nicely - plus it's almost 2am and I can't be bothered to keep typing!
"oh mummy, oh daddy - lets all play Kabadi!"