No one's morals come from a book. No one's. The codes some religious people -choose- to live their lives by are not their morals, they are just guides. Not everyone has parents who teach them morals, and not everyone has empathy. Some people refer to their religious code to guide them, that doesn't mean they have no morals outside of it or that they got their morals FROM it.
You are misunderstanding the definition of religion. In the broad sense, Atheism could technically be considered a religion. A religion actually does not require doctrine, books, codes, or commandments, it does not require a God, or even an idea of an afterlife.
There are a few religions that have no deities. Paganism is a theistic religion, but we have no set codes, no holy book, no consensus on an afterlife, and no agreement about God. In a random sample of people who call themselves Pagan, we have fewer things in common with each other than a similar sampling of Atheists have with each other.
A religion is simply a deeply held belief, and a devotion to that belief. It is not a lack of belief, you can't define something in the negative. You aren't lacking anything, you believe that there are no Gods. When there isn't any proof (and lets be honest, there isn't any concrete proof one way or the other) you have a belief. You choose to devote to the idea that there are no Gods and no afterlife. You happen to be part of a large body of other people who believe the same thing. You devote time and energy to the idea, and you are either steadfast in this belief, or you refuse to even consider it to be a belief (just like the certainty many theists have about their beliefs). Some Atheists even try to convert people from their religions to Atheism.
How hard, really, looked at this way, is it to see Atheism as the religion of Godlessness? The problem is that so many Atheists have negative feelings about religion, and so the very idea of any common ground is repellant- to the point of indignation, and even rage. But the truth of the matter is that there is more than enough evidence to consider Atheism a religion, the only thing missing, really, is Atheists agreeing with it. If Atheists could ever get over their anti-religion complexes enough to admit it, or decided to fight fire with fire and actually claim it, they'd be a pretty powerful religion.
