Because atheist see it as stupidity that interferes with the world and people's lives. So as a result, they can't avoid it.
Religion is the core of people's lives.
People think that they know at least a little of the future. Why? Because all kinds of things that they do produce results almost exactly like they were thinking.
People don't really know any of the future? Why? Because they aren't smart enough. The fact that they have failures shows that they don't know the future.
Way down deep in their minds, people all know that they don't know anything at all about the future. This is why they all have religion, whatever that religion might be. Religion protects them (they think) from the future that they realize they don't really know anything about.
Atheists simply want to avoid the idea that they don't know about their future. That's the real reason why they avoid religion. They want to think that they are in control of their lives.
If atheists were in any kind of control of their lives the way they wanted, they would make themselves be healthy enough so they would never die.
Atheists, like all others, have no control over their life, even when it seems like they do. And their delusion that suggests that pushing religion out of their lives is going to change things, is a complete lie.
