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I don't know. To sell a story, maybe? To feel important?
What on Earth are you on about? And what meaning does "better" have in this context?
Just because past events have led to this point, where we have life, humanity, society, religion and all that does not automatically imply that we were the reason for everything that came before us. To suggest otherwise (without foundation, at least) is the height of hubris.
As an analogy, consider wind. Could I come up with something that's more suited for driving sailboats and windmills than wind? Probably not. Does this mean that wind must be caused by the Breath of God, and not by natural convection and pressure differentials? Definitely not.