I think it would be a far more thoughtful place to live.
I take China Doll's point, that the teachings of most religions are peaceful and loving.
But imagine a world where people looked out for their fellow man and tried to lead as good a life as possible, not because they were told to by a book or a prophet or a clergyman or a deity (and because they feared repercussions in the afterlife), but because they decided themselves that it was something they wanted to do. A world where goodness is an end in itself rather than an insurance policy.