For a science vs. religion thread, this is a deeply philosophical comment. But here's the thing, enough whispers eventually add up into a chorus. When you die, that doesn't mean you are forgotten. If you make a difference, coming up with the theory, of evolution for example, could lead to others after you being effected, so in the end your life and what you believe in it matters. Also, it's human nature to yearn to understand the world (well, human nature for some, others are content just to sit and do nothing, but don't get me started on that.) and evolution helps us understand how the universe around us functions.