What if humans didn't have moral lines drawn? It's depressing to know that one day I will die and never exist again; why believe it? It's hard to believe that humans were an accident, or were a product of what was once molecules floating in space.
Religion will never die out. Humans have done this into past, they try to drift away from what's right, and they end up far worse than before. It's the only thing keeping our secular world sane.