This YouTube video, called A World Without Religion: It's a matter of mindset, by YouTube poster BlasphemyBaby, perfectly sums up my own feelings on what the world would be like if religion suddenly vanished. "Would the world really be a better place?" she asks, and then answers herself: "Kinda."
This other video by the same poster, titled Where does morality come from: an atheist perspective, nicely encapsulates the theory that morality does not come from scripture, it comes from humans' need to co-exist, just like any social animal.
Out of the mouths of babes.