As humans, we're dynamic realities. We have to exist in this world and live our lives here for a whole variety of reasons. Survival is an issue, and survival entails more than merely staying alive; it also deals with our being able to belong to a community and function according to the rules and regulations of a society.
So we develop identities based around the natural impulses we have combined with our "soul" impulses, as it were, curtailed and molded by the language we speak and the culture into which we're born.
Bringing this all around, one of the more bizarre things I see happen among atheists is the "evangelical atheist." Often (but not always), these are people who were raised in Christianity formerly and become outspoken atheists. Suddenly, all the evils of the world have only one possible source: religion. Get rid of religion, get rid of religious people, and then the world would be a perfect place.
Moreover, another sophomoric view here is the assumption that "religion" is a homogenous category, that all religions everywhere are identical in practice to the particularly bizarre views that erupt in American Evangelical Christianity.
This phase is overall volatile for many reasons, and unfortunately, too many people get stuck in this phase, building entire identities around it.
But if one can grow out of it, if one can master those tendencies, if one can see that yes, too often our religions are given over to people with childlike minds and immature understandings but that there's more to it, if one can become not merely an atheist parody of the systems one criticizes, then perhaps, just perhaps, there's something far, far greater on the other side.
It isn't easy, but it can be done.