SPOILER:
Humans have finite lifespans.
Music and visuals are pretty good. It's a very, very short game, of course. I'll give it the credit of advancing a highly debatable point of view sufficiently to draw people into conversation. Only one niggle on that point: it's so bluntly presented that I think it could easily turn people off, or send them the other direction. This is something atheistic arguments often forget... given that the entire concept of religion by definition works beyond the empirical realm, the hypothesis that any one religion is accurate is not testable and therefore not *disprovable* by those means. This is what leads me to question what the author intends... it seems as though the only people likely to resonate with the game already agree with the message. If so, it doesn't seem like it would change anyone's mind... just offer a brief moment of depression.
Still, I don't want to come off too harsh. There are plenty of much longer flash games out there that are trying to do the same thing and, ironically, eat up more of your precious life to do it. Even if pretty much all of these leave me a little confused as to why they exist, I must admit this is the leader, so far. The thought-bubble platforming concept was very clever too, especially in the way it interacted with the overall message.
What the heck... four stars. It pains me greatly to do this, since I am generally fairly harsh on message games... but I am so only because so many fail to convey their message. There is still a star lost for the questionable exigency of the game. The message is clearly conveyed, but if it's only being conveyed to people who already agree, I can't possibly see what it benefits people. Certainly not enjoyment... it's impossible for a game with this message to be "fun". The best I can say is that people who agree will have the satisfaction of corroboration, but that's kind of a second-place prize in the market of ideas. I'd give suggestions for how to improve that point, but honestly, it's your argument, so that decision is up to you.
Overall, however, well done.